var nMyHeight = 0 ;

function getWindowHeight(){
	if(window.innerHeight)return window.innerHeight;
	if(document.documentElement.clientHeight) {
		return document.documentElement.clientHeight;
	}else {
		if(document.body.clientHeight)return document.body.clientHeight;
	}
	return-1;
}
function resize() {
	nMyHeight = getWindowHeight() - 180;
	document.getElementById('scroll').style.height = nMyHeight+"px";
}