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Add an Event Cross-Browser

This is a method that checks for the standard addEventListener() or ActiveX's attachEvent() and will assign the event appropriately depending on the browser accessing the page.

                                function addEvent(elem, event, func){  
	if(document.addEventListener){  
		elem.addEventListener(event, func, false);  
	}else if(document.attachEvent){  
		elem.attachEvent('on' + event, func);  
	}else{  
		elem['on' + event] = func;  
	}     
}
                            

Here is how it can be used.

                                // passing anonymous function
addEvent(window, 'load', function(){  
	// any code to run
});  
	
addEvent(someForm, 'keyup', validateField);