Get xpath string expression of a document element (See related posts)

function getElementXPath(elt)
{
     var path = "";
     for (; elt && elt.nodeType == 1; elt = elt.parentNode)
     {
   	idx = getElementIdx(elt);
	xname = elt.tagName;
	if (idx > 1) xname += "[" + idx + "]";
	path = "/" + xname + path;
     }
 
     return path;	
}

function getElementIdx(elt)
{
    var count = 1;
    for (var sib = elt.previousSibling; sib ; sib = sib.previousSibling)
    {
        if(sib.nodeType == 1 && sib.tagName == elt.tagName)	count++
    }
    
    return count;
}