Event.observe and clickElem.addEventListener giving me undefined error

[rakesh krish]

Hello All,

I was trying to use Event.observe and but i am getting undefined error. I used clickElem as well but to no avail.

Event.observe(window,'load',function() {
	setDefaultSinceDateForCommon();
});

and 

clickElem.addEventListener("load", function(evt) {
	setDefaultSinceDateForCommon();}, false); 

Is there any alternative for Event.observe or clickElem in plain JavaScript?? IE is throwing me undefined error for both scenarios

[Bear Bibeault]

Event handling in JavaScript