var coursesSub;
var pageWidth = 760;

function getWidth() {

	var bWidth;

	if (document.all != null) {
		//alert('ie');
		bWidth = document.body.clientWidth;
	} else {
		//alert("mozilla");
		bWidth = window.innerWidth;
	}

	//alert(bWidth);
	
	coursesSub = ((bWidth - 760) / 2) + 100;
	
	document.getElementById('sub_courses').style.left = coursesSub + "px";
	
	//alert(coursesSub);
}

function showSub(element) {
	if (element == "courses") {
		document.getElementById('sub_courses').style.visibility = "visible";
		//var t = window.setTimeout("hideSub('courses')",5000);
	}
}

function hideSub() {
	document.getElementById('sub_courses').style.visibility = "hidden";
}