How do I continue to a url after a javascript check?

Here is the javascript:
 
function ReadCookie(CookieName)
{
  var CookieString = document.cookie;
  var CookieSet = CookieString.split (';');
  var SetSize = CookieSet.length;
  var ReturnValue = "";
  var CookiePieces;
  var x = 0;
  
  for (x = 0; ((x < SetSize) && (ReturnValue == "")); x++)
  {
    CookiePieces = CookieSet[x].split ('=');
 
    if (CookiePieces[0].substring (0,1) == ' ')
    {
      CookiePieces[0] = CookiePieces[0].substring (1, CookiePieces[0].length);
    }
    
    if (CookiePieces[0] == CookieName)
    {
      ReturnValue = CookiePieces[1];
    }
  }
 
  if (ReturnValue == 'yes') {
  }
  else if (ReturnValue == 'no') {
	document.form1.dob_day.readOnly = "true";
	document.form1.dob_month.readOnly = "true";
	document.form1.dob_year.readOnly = "true";
  }
}
 
function WriteCookie(CookieName,CookieValue)
{
	days = 1;
	var date = new Date();
	date.setTime(date.getTime()+(days*24*60*60*1000));
	var expires = "; expires="+date.toGMTString();
    document.cookie = CookieName + "=" + escape(CookieValue)+expires;
	return CookieValue;
}
 
function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0) { date.setTime(date.getTime() - skew); }
}
 
// determine age
function howOld(day,month,year) {
    var c = new Date(); // a new instance
    fixDate(c);	
    var thisDay = c.getDate();
    var thisMonth = c.getMonth() + 1;
    var thisYear = c.getFullYear();
	if(!(year <= 06)){
	year = parseInt("19" + year, 10);
	}
	else year = parseInt("20" + year, 10);
    var yearsold = thisYear - year; 
    var monthsold = 0;
    var daysold = 0;
    var age = '';
 
    if (thisMonth >= month) {
      monthsold = thisMonth - month;
    }
    else {
      yearsold--;
      monthsold = thisMonth + 12 - month;
    }
 
    if (thisDay >= day) {
     daysold = thisDay - day;
    }
    else {
        if (monthsold > 0) {
          monthsold--;
        }
        else {
          yearsold--;
          monthsold += 11;
        }
        daysold = thisDay + 31 - day;
    }
 
    if (yearsold < 0) return '';
 
    if ((yearsold == 0) && (monthsold == 0) && (daysold == 0)) return '';
 
    if (yearsold > 0) {
        age = yearsold;
        if (yearsold > 1) age;
        age += ' ';
    }
 
    return age;
}
 
 
function doSubmit() {
 var f = document.form1;
 var dob,theMonth,theDay;
 
 /* Validate month: check for digits, then check:  1 <= month <= 12 */
 if(f.dob_month.value.match(/\d{1,2}/)) {
   theMonth = eval(f.dob_month.value);		
   if(!(theMonth <= 12 && theMonth >= 1)){
     alert('Please enter a valid month of birth.');
     f.dob_month.focus();
     f.dob_month.select(); 
     return(false); 
  }
 } 
 else {
  alert('Please enter a valid month of birth.');
  f.dob_month.focus();
  f.dob_month.select(); 
  return(false); 
 }
  
 /* Validate day: check for digits, then check:  1 <= day <= 31 */
 if(f.dob_day.value.match(/\d{1,2}/)) {
   theDay = eval(f.dob_day.value);
   if(!(theDay >= 1 && theDay <= 31)) {
      alert('Please enter a valid day of birth.'); 
      f.dob_day.focus(); 
      f.dob_day.select(); 
      return(false); 
   }
 }
 else {
   alert('Please enter a valid day of birth.'); 
   f.dob_day.focus(); 
   f.dob_day.select(); 
   return(false); 
 }
 
 if(!f.dob_year.value.match(/\d{2}/) || f.dob_year.value=="00") { 
    alert('Please enter a valid year of birth (xx).'); 
    f.dob_year.focus(); 
    f.dob_year.select(); 
    return(false); 
 }
 
 var age = howOld(f.dob_day.value, f.dob_month.value, f.dob_year.value);
 
 if((age >= 21) && (age <= 150)) {
    dob = f.dob_year.value + "-" + f.dob_month.value + "-" + f.dob_day.value;
	WriteCookie('admit','yes');
 }
else {
   WriteCookie('admit','no');
   window.location.replace('Blah.pl?');
   return(false);
   }
if(!document.getElementById("agree").checked){alert('Check the agree box to enter this site.');return false;}
 
//f.submit();
return(true);
}
 
function goHigh() {
  goPage('true');
}
 
function goLow() {
  goPage('false');
}
 
function goPage(speed) {
  if(doSubmit()) {
      var query = window.location.search.substring(1);
      var pairs = query.split("&");
      var referUrl;
      
      for (var i=0;i<pairs.length;i++)
	   {
         var temp = pairs[i];
         var arr1 = temp.split("=");
         if (arr1[0] == "referUrl") {
             referUrl = arr1[1];
         }		   
	   }
 
      if (referUrl) {
         document.location.href= unescape(referUrl);
      } else {
         document.location.href='Blah.pl?' ;
      }
      
  }
}
 
And the form:
<script type="text/javascript" src="$bdocsdir/age_validation.js"></script>
<script type="text/javascript" src="$bdocsdir/javascript.js"></script>
<div align="center"><br />
<strong><font size="3" face="Arial">THIS SITE CONTAINS ADULT-ORIENTATED, AGE RESTRICTED MATERIALS. 
<br />
YOU MUST BE AT LEAST 18 YEARS OLD (21 YEARS OF AGE IN SOME AREAS OF THE UNITED STATES)<br />
TO ENTER THIS ADULT BOARD.</font></strong> <br /><br />
<strong><font size="2" face="Arial">By Entering this site, you are agreeing to all 
of the <font color="#FF0000">terms and conditions</font> set forth in this site.<br /> Further more, </font></b>
<font face="Arial" size="2"> <b>"I hereby attest, under the penalties of perjury, that I was born on the following month, day and year:</b></font><font face="Arial">
</strong></font>
</div>
<br />
<div align="center">
<form action="$surl\lb-$boardid/" method="get" name="form1" id="form1" onsubmit="return doSubmit();">
<input name="dob_day" id="dob_day" value="dd" size="2" maxlength="2" class="black" tabindex="2" onfocus="if(this.value=='dd')this.value='';" onblur="if(this.value=='')this.value='dd';" type="text" />
<input name="dob_month" id="dob_month" value="mm" size="2" maxlength="2" class="black" tabindex="1" onfocus="if(this.value=='mm')this.value='';" onblur="if(this.value=='')this.value='mm';" type="text" />
<input name="dob_year" id="dob_year" value="yy" size="2" maxlength="2" tabindex="3" onfocus="if(this.value=='yy')this.value='';" onblur="if(this.value=='')this.value='yy';" type="text" />
<br /><br />
<div><strong><font size="2" font face="Arial">Please note: This information is 
being asked in a good faith effort to comply with the Child Online Protection Act (COPA) 
and other related laws.<br /> Providing false declarations under the penalties of 
perjury is a <font color="#FF0000">criminal offense</font> and punishable by law 
including significant fines and prison time</font>.</strong></div>
<br />
<div><font face="Arial" color="#FF0000">I Understand & Agree to all of the above: 
</font> 
<input type="checkbox" value="0" height="100", width="100" id="agree" name="C1" style="width: 25px; height: 25px; border-style: solid; border-width: 1px; padding: 4px">
<br />
<br />
<input type="submit" value="BY CLICKING HERE: I certify that the birth date I have entered above is my lawful legal birth date." onclickpress="return submitenter(this,event)" />
</form>

                                  

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