function registerListeners()
{
	var cascoSelect=document.getElementById("Dekking");

	if (cascoSelect.attachEvent) 
	{
		cascoSelect.attachEvent("onchange", checkCascoDekking);
	}
	else if (cascoSelect.addEventListener) 
	{
		cascoSelect.addEventListener("change", checkCascoDekking, false);
	} 

	checkCascoDekking();
};

if (window.addEventListener) 
{
	window.addEventListener("load", registerListeners, false);
} 
else if (window.attachEvent) 
{
	window.attachEvent("onload", registerListeners);
} 
else if (document.getElementById) 
{
	window.onload=registerListeners;
};