js_get_elementLeft()

/**
* Gets the horizontal position of an element.
*
* Credit: http://www.aspandjavascript.co.uk/javascript/javascript_api/get_element_top_left.asp
*/
function js_get_elementLeft(elem) {

xPos = elem.offsetLeft;
tempEl = elem.offsetParent;
while (tempEl != null) {
xPos += tempEl.offsetLeft;
tempEl = tempEl.offsetParent;
}
return xPos;

}