JavaScript and browser differences for showing/hiding divs

I am having browser issues with a function that is supposed to show one div and hide another.  After the page loads, they are supposed to switch so that the previously visible div is hidden and the previously hidden div is visible.  This works great in IE, but in Netscape both divs are shown all the time.  In Safari, only the content div shows.  I would like for this to behave properly in all major browsers if at all possible.  
Here's the function:

<script type="text/javascript">
  <!--
    function showMessage() {
      if(document.all){
                //browser="ie"
            document.all.MessageDiv.style.visibility = "visible";
            document.all.ContentDiv.style.visibility = "hidden";
            }
      else if(document.layers){
      //browser="NN4";
            document.MessageDiv.visibility = "show";
            document.ContentDiv.visibility = "hide";
            }
      else if(!document.all && document.getElementById){
                //browser="NN6";
            document.getElementByID("MessageDiv").style.visibility = "visible";
            document.getElementByID("ContentDiv").style.visibility = "hidden";
            }
      }
      -->
</script>

This function is just for showing the message/hiding the content.  At the end of the page I then switch them.  The rest of the page is asp/html.  I don't know JavaScript well at all and don't usually use it, but I didn't know of another way to do this.  Any assistance would be greatly appreciated.
mjholdenAsked:
Who is Participating?
 
Asta CuTechnical consultant & graphic designCommented:
The thing is that IE and NS implement JavaScript somewhat differently as a result of variations in the Document Object Model as well as in other aspects. That is further complicated by varying versions installed; here's one sampling from our PAQ database:
http://www.experts-exchange.com/Web/Web_Languages/JavaScript/Q_20611570.html?query=div+netscape+javascript&clearTAFilter=true
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rockmansatticCommented:
I would consider placing this question in the Javascript section, possibly just a 20pt link.

Good Luck
Rockman
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mjholdenAuthor Commented:
Thank you both for your comments.  I'll try out some of the suggestions from the post mentioned.

Is there any (relatively easy) way to do what I want without JavaScript?
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mjholdenAuthor Commented:
Thank you astaec!  The post you suggested contained code that was very close to what I needed, so I was able to fix the problem.
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Asta CuTechnical consultant & graphic designCommented:
YAY!  I'm so pleased.  Thank you for the good news and the fine grade.  I'm happy I could help you.
Best wishes,
":0) Asta
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