the following function calculates a dom's jQ selector

dom-selector.js

function getXPaths (dom){

    //If dom has id and making sure no other dom has the same id
    function hasUniquId (dom){
        return (dom.id && dom.id.length) && ($("[id="+dom.id+"]").size() > 1);
    }

    //If dom has any siblings , if yes then it's position
    function getPositionInSiblings(dom){

        var tagName = dom.tagName.toLowerCase() ,
            childs  = $(dom.parentNode).find(tagName),
            tmpKlss = 'tmpKlss_' + Math.random().toString().replace('.','') ;

        $(dom).addClass(tmpKlss);

        for(var i = 0; i< childs.size(); i++){

            var tmpOb = childs[i];

            if($(tmpOb).hasClass(tmpKlss)){
                $(tmpOb).removeClass(tmpKlss);
                return i;
            }
        }

        return false;
    }

    function getMyQuery(dom){

        //If body, then tag itself good enough as selector
        if(dom.nodeName.toLowerCase() == 'body'){
            return 'body';
        }

        //If dom has unique id, then selector is #id
        if(hasUniquId (dom)) {
            return '#' + dom.id;
        }

        //recursively calculate doms selector         
        var i = getPositionInSiblings(dom);
        return ( i === false) ?
            getMyQuery(dom.parentNode) + ' ' + dom.tagName :
            getMyQuery(dom.parentNode) + ' ' + dom.tagName + ':eq(' + i + ')';

    }


    return getMyQuery(dom);
}