function setColHight()
{
 var i = Math.max(document.getElementById('left').offsetHeight, document.getElementById('right').offsetHeight);
 var p = Math.max(document.getElementById('content_area').offsetHeight, i)
 var maxHight = Math.max(p, document.getElementById('content').offsetHeight);
 maxHight = maxHight + 30;
 if(document.getElementById('left').offsetHeight != maxHight)
 {
  document.getElementById('left').style.height=maxHight+'px';
 }
 if(document.getElementById('right').offsetHeight != maxHight)
 {
  document.getElementById('right').style.height=maxHight+'px';
 }
 if(document.getElementById('content').offsetHeight != maxHight)
 {
  document.getElementById('content').style.height=maxHight+'px';
 }
}