// To call functions when page loads
// example call: addLoadEvent(function() {  document.body.style.backgroundColor = 'yellow';  })

function returnObjById( id ) { 
if (document.getElementById)  {
var returnVar = document.getElementById(id); 
} else if (document.all) {
var returnVar = document.all[id];
} else if (document.layers) {
var returnVar = document.layers[id]; 
}
return returnVar; 
} 

function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}