var $bodyId = "body";
var $baseId = "base";

function getWindowHeight()
{
	 var windowHeight = 0;
	 if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	 }
	 else {
		if (document.documentElement && document.documentElement.clientHeight) {
		   windowHeight = document.documentElement.clientHeight;
		}
		else {
		   if (document.body && document.body.clientHeight) {
			  windowHeight = document.body.clientHeight;
		   }
		}
	 }
	 return windowHeight;
  }

function base(){
	document.getElementById($baseId).style.marginTop = 0 + "px";
	$winHeight = getWindowHeight();
	$bodyHeight = document.getElementById($bodyId).offsetHeight;
	$baseHeight = document.getElementById($baseId).offsetHeight;
	$difHeight = $winHeight - ($bodyHeight + $baseHeight);	
	if ($difHeight > 0) {
		document.getElementById($baseId).style.marginTop = $difHeight + "px";
	}
}



function opendiv(){
	
}