onmouseout problem with div menu

Please see the attached code snippet below. I am displaying the menu with the img and div elements. when I click on the image drop down icon, the menu will be displaued(with div tags). I want to close the menu as soon as  I move the mouse out of the menu. can some one help me to resolve this issue. Thanks in advance.

<img id='IdReplyArrowImage1' alt=""
						             src='/ResultsReview/images/downbtn16x12.gif' height="20px" width="13px"
						
						             style='vertical-align:bottom; border-width:0px;display:inline;position:relative;left:-4px;'
						
						             onmouseover="this.style.cursor='hand';this.src='/ResultsReview/images/rec_pat_up.gif';"
						             onmouseout="this.style.cursor='default';this.src='/ResultsReview/images/downbtn16x12.gif';"
						             onclick="showPopupWindow(oPopup, document.all.popupLockDiv, document.all.IdReplyArrowImage1, -60, 0)">		
						             
									<div id="popupLockDiv" toggle="fade" style="display: none;" class="wfTitleMenu" style="overflow:auto; height:350px; z-index: 100;">
									  <div style="border:1 solid #000000; background-color:#F5F5F5; font-family:Arial,Helvetica,sans-serif; font-size:8pt">
									    <div id="stdDiv"
									         onmouseover="this.style.backgroundColor='#000000'; this.style.color='#FFFFFF'"
									         onmouseout="this.style.backgroundColor='#F5F5F5'; this.style.color='#000000'"
									         style = "cursor:hand" onclick="parent.onSaveAndPrint('Standard');">&nbsp;Standard</div>
									
									    <div id="lrDiv"
									         onmouseover="this.style.backgroundColor='#000000'; this.style.color='#FFFFFF'"
									         onmouseout="this.style.backgroundColor='#F5F5F5'; this.style.color='#000000'"
									         style = "cursor:hand" onclick="parent.onSaveAndPrint('Legal-Record');">&nbsp;Legal-Record
									         </div>  
									         
									     <div id="pmDiv"
									         onmouseover="this.style.backgroundColor='#000000'; this.style.color='#FFFFFF'"
									         onmouseout="this.style.backgroundColor='#F5F5F5'; this.style.color='#000000'"
									         style = "cursor:hand" onclick="parent.onSaveAndPrint('Patient-Mailer');">&nbsp;Patient-Mailer
									     </div>
									     <div id="lhDiv"
									         onmouseover="this.style.backgroundColor='#000000'; this.style.color='#FFFFFF'"
									         onmouseout="this.style.backgroundColor='#F5F5F5'; this.style.color='#000000'"
									         style = "cursor:hand" onclick="parent.onSaveAndPrint('Letter-Head');">&nbsp;Letter-Head
									     </div>        
									   </div>     
									</div>

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