function checkHeight()
	{
		var winW = 630, winH = 460;
		
		if (parseInt(navigator.appVersion)>3) {
		 if (navigator.appName=="Netscape") {
		  winW = window.innerWidth;
		  winH = window.innerHeight;
		  if(document.getElementById('content_holder').offsetHeight<(winH-291)){
			document.getElementById('content_holder').style.height=(winH-291)+'px';
			}
		 }
		 if (navigator.appName.indexOf("Microsoft")!=-1) {
		  winW = document.body.offsetWidth;
		  winH = document.documentElement.clientHeight;
		 	winH=winH;
            
		  if(document.getElementById('content_holder').offsetHeight<(winH-291)){
			document.getElementById('content_holder').style.height=(winH-291)+'px';
			}
		 }
	
		}
		
		
	}