<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="if(this.value.indexOf('Tue')==0) document.getElementById('textareaID').style.display='block'; else document.getElementById('textareaID').style.display='none';">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<select name=t2 onchange="if(this.value.indexOf('Wed')==0) document.getElementById('textareaID2').style.display='block'; else document.getElementById('textareaID2').style.display='none';">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="if(this.value.indexOf('Tue')==0){document.getElementById('textareaID2').style.display='none';document.getElementById('textareaID').style.display='block';}else{document.getElementById('textareaID2').style.display='block';document.getElementById('textareaID').style.display='none';}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<select name=t2 onchange="if(this.value.indexOf('Wed')==0){document.getElementById('textareaID').style.display='none';document.getElementById('textareaID2').style.display='block';}else{document.getElementById('textareaID').style.display='block';document.getElementById('textareaID2').style.display='none';}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<input type="radio" value="Mon" name="t1" />Mon<br />
<input type="radio" value="Tue" name="t1" onclick="if(this.checked) {document.getElementById('textareaID').style.display='block';document.getElementById('textareaID2').style.display='none';}" />Tue<br />
<input type="radio" value="Wed" name="t1" onclick="if(this.checked) {document.getElementById('textareaID2').style.display='block';document.getElementById('textareaID').style.display='none';}" />Wed<br />
<input type="radio" value="Thu" name="t1" />Thu<br />
<input type="radio" value="Fri" name="t1" />Fri<br />
<input type="radio" value="Sat" name="t1" />Sat<br />
<input type="radio" value="Sun" name="t1" />Sun<br />
<input type="submit" value="Submit" />
<textarea id="textareaID" cols="20" rows="20" style="display:none">1</textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none">2</textarea>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="if(this.value.indexOf('Tue')==0){document.getElementById('textareaID2').style.display='none';document.getElementById('textareaID').style.display='block';}else{document.getElementById('textareaID2').style.display='block';document.getElementById('textareaID').style.display='none';}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<select name=t2 onchange="if(this.value.indexOf('Wed')==0){document.getElementById('textareaID').style.display='none';document.getElementById('textareaID2').style.display='block';}else{document.getElementById('textareaID').style.display='block';document.getElementById('textareaID2').style.display='none';}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="function $(o){return document.getElementById(o);};$('textareaID').style.display='none';$('textareaID2').style.display='none';var _s=this.value.substr(0,3).toLowerCase();switch(_s){case 'tue':$('textareaID').style.display='block';break;case 'wed':$('textareaID2').style.display='block';break;}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<select name=t2 onchange="function $(o){return document.getElementById(o);};$('textareaID').style.display='none';$('textareaID2').style.display='none';var _s=this.value.substr(0,3).toLowerCase();switch(_s){case 'wed':$('textareaID2').style.display='block';break;case 'tue':$('textareaID').style.display='block';break;}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="function $(o){return document.getElementById(o);};$('textareaID').style.display='none';$('textareaID2').style.display='none';var _s=this.value.substr(0,3).toLowerCase();switch(_s){case 'tue':$('textareaID').style.display='block';break;case 'wed':$('textareaID2').style.display='block';break;}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<select name=t2 onchange="function $(o){return document.getElementById(o);};$('textareaID').style.display='none';$('textareaID2').style.display='none';var _s=this.value.substr(0,3).toLowerCase();switch(_s){case 'wed':$('textareaID2').style.display='block';break;case 'tue':$('textareaID').style.display='block';break;}">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
<textarea id="textareaID2" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>
<textarea></textarea>
Dont know about php sorry.