/**
 * @author Corstiaan
 */
    function ShowElement(ElementId)
    {    
    	var el = document.getElementById(ElementId);
	el.style.display = 'block';
    }
    
    function HideElement(ElementId) 
    {
    	var el = document.getElementById(ElementId);
	el.style.display = 'none';
    }
    
    function AddLoadEvent(func) 
    {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') 
	{
	    window.onload = func;
	} 
	else 
	{
	    window.onload = function() 
	    {
	    	oldonload();
		func();
	    }
	}
    }