function getwinheight() {
var windowheight;
var midmenueheight;
	if (window.innerHeight) {
		windowheight = window.innerHeight  //  gecko + webkit
	} else {
		windowheight = document.body.clientHeight  // IE
	}
	midmenueheight = parseInt(windowheight)-145;
	document.getElementById("middle").style.height = midmenueheight+"px";

}

window.onload = getwinheight;
window.onresize = getwinheight;