matchColumns=function(){ 

     var middledivheight,rightdivheight; 
	
	 middledivheight=document.getElementById('col1').offsetHeight - 5; 
	 rightdivheight = document.getElementById('col2').offsetHeight - 5; 

     if ( middledivheight > rightdivheight) {
		 document.getElementById('col2').style.height = middledivheight + "px";
	 } else {
		 document.getElementById('col1').style.height = rightdivheight + "px";
	 }
} 

// Runs the script when page loads 

window.onload=function(){ 

     if(document.getElementsByTagName){ 

          matchColumns();			 

     } 

}