function ajaxCmbPosition(keyName,spanName) {
var key = document.getElementById(keyName);
var spn = document.getElementById(spanName);
var inf = new positionInfo(key);
var top = inf.getElementTop();
var lef = inf.getElementLeft();
var btm = inf.getElementBottom();
spn.style.left = lef+'px';
spn.style.top  = btm+'px';
}