var trs = document.getElementsByTagName("tr");

      window.onload = function(){

        for(var i=1; i<trs.length; i++){

            trs[i].setAttribute(onmouseover,"onMover("+i+")");

            trs[i].setAttribute(onmouseout,"onMout("+i+")");

        }

}

function onmover(n){

    trs[n].style.backgroundColor= "#f2f2f2";

}

function onMout(n){

    trs[n].style.backgroundColor="#fff";

}