onMousedown로 div를 분류하기

script

<script>
function PayDiv(str) {
 if (str == "a") {
  div_a.style.display = "";
  div_b.style.display = "none";
  div_c.style.display = "none";
 }
  else if (str == "b") {
  div_a.style.display = "none";
  div_b.style.display = "";
  div_c.style.display = "none";
 }
  else if (str == "c") {
  div_a.style.display = "none";
  div_b.style.display = "none";
  div_c.style.display = "";
 }

}
<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</SCRIPT>

아래 직접적인 table

<div id = "div_a" style = "display:''" >  <table  border="0" cellspacing="0" cellpadding="0">
      <tr>
       <td width="64" align="left"><a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('999','','/images/r1.jpg',1)" onMousedown="PayDiv('a');"><img src="/images/r1-2.jpg" width="63" height="20" /></a></td>
       <td align="center"><a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('999','','/images/r2-2.jpg',1)" onMousedown="PayDiv('b');"><img src="/images/r2.jpg" width="63" height="20" /></a></td>
       <td width="64" align="right"><a href="/bbs/board.php?bo_table=qna" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('999','','/images/r3-2.jpg',1)" onMousedown="PayDiv('c');"><img src="/images/r3.jpg" width="63" height="20" /></a></td>
      </tr>
     </table> </div>
<div id = "div_b" style = "display:'none'" >   </div>
<div id = "div_c" style = "display:'none'"  >   </div>

입니다.