function getHeight(el) {
	var x = document.getElementById(el);
	try {
		var y = x.currentStyle['height'];
		
	}
	catch (err) {
		var y = document.defaultView.getComputedStyle(document.getElementById(el),null).height;
	}
	
	y = y.substring(0,y.length-2)
	
	return Number(y);
}