function subWrapperHeight() {
	if(document.getElementById) {
   
		var currHeight = 0;
		var maxHeight = 0;
		pageColumns = new Array('position2', 'position3', 'position4', 'subWrapper');
		
		
		for (i = 0; i < pageColumns.length; i++) {
			if (document.getElementById(pageColumns[i])) {
				document.getElementById(pageColumns[i]).style.height = "";
				currHeight = document.getElementById(pageColumns[i]).offsetHeight;
				if (currHeight > maxHeight) {
					maxHeight = currHeight;
				}
			}
		}
		
		for (i = 0; i < pageColumns.length; i++) {
			if (document.getElementById(pageColumns[i])) {
				if (document.getElementById(pageColumns[i]).offsetHeight < maxHeight) {
					document.getElementById(pageColumns[i]).style.height = maxHeight+"px";
					/*alert(document.getElementById(pageColumns[i]).style.height);*/
				}
			}
		}
	}
}