function height() {
	 var viewportheight;

	 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight

	 if (typeof window.innerWidth != 'undefined')
	 {
	      viewportheight = window.innerHeight
	 }

	// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)

	 else if (typeof document.documentElement != 'undefined'
	     && typeof document.documentElement.clientWidth !=
	     'undefined' && document.documentElement.clientWidth != 0)
	 {
	       viewportheight = document.documentElement.clientHeight
	 }

	 // older versions of IE

	 else
	 {
	       viewportheight = document.getElementsByTagName('body')[0].clientHeight
	 }
 
	var div_container = document.getElementById('container').offsetHeight;
	
	if (viewportheight > div_container)
	{
		document.getElementById('container').style.top = (viewportheight - 682)/2 + 'px' ;
	}	
}

function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}

addLoadEvent(height);