/* Functions to determine the position and dimensions of DOM-elements */

function getpos_left (obj) {   
	var left = 0;
	while ( obj != null ) {
		left += obj.offsetLeft;
		obj = obj.offsetParent;
	}
	return left;
}

function getpos_top (obj) {   
	var top = 0;
	while ( obj != null ) {
		top += obj.offsetTop;
		obj = obj.offsetParent;
	}
	return top;
}

function getsize_width(obj) {
	return obj.offsetWidth;
}

function getsize_height(obj) {
	return obj.offsetHeight;
}