function positionfooter() {
  if(document.layers)	{
	  	div1 = document.layers["content_center"];
	  	div2 = document.layers["content_left"];
	  	div3 = document.layers["content_right"];
	  	div4 = document.layers["wrapper"];
	  	div5=document.layers["navtrail"];
	}        // NC 4
   else if (document.all) {
   	div1 =  document.all["content_center"];
   	div2 =  document.all["content_left"];
   	div3 = document.all["content_right"];
   	div4 =  document.all["wrapper"];
   	div5 =  document.all["navtrail"];
	 }          // IE 4
   else if (document.getElementById) {
	  div1 = document.getElementById("content_center");
	  div2 = document.getElementById("content_left");
   	div3 = document.getElementById("content_right");
	  div4 = document.getElementById("wrapper");
	  div5 = document.getElementById("navtrail");
	} // DOM
	div1.style.top=(172+div5.offsetHeight)+"px";
	mytop=Math.max(div1.offsetHeight, div2.offsetHeight, div3.offsetHeight)+40;
	div3.style.height=mytop+"px";
}