resize = function checkRes(){ 
if (navigator.appName=='Microsoft Internet Explorer'){ 
    var IE_Width = document.body.clientWidth; 
    var IE_Height = document.body.clientHeight; 
    setRes( IE_Height ); 
}

} 

function setRes( height ){ 
	setHeight = height-131; 
	if (setHeight < 0)
	{
		setHeight = 0;
	}
	document.getElementById('wrapper').style.height=setHeight; 
} 

window.onresize = window.onload = resize;