function cascade() {
    var parentId = "select[id*=ddl_soort]";
    var options = {
        childId: "select[id*=ddl_merk]",
        url: "/merken.asmx/GetMerkenForRubriek",
        parameterName: "rubriekID",
        selectedValue: selectedValue,
        firstValue: firstValue
    };
    jQuery(parentId).cascade(options);

    var parentId = "select[id*=ddl_merk]";
	var options = {
		childId: "select[id*=ddl_type]",
		url: "/merken.asmx/GetTypesForMerk",
		parameterName: "merk",
		selectedValue: selectedValueType,
		firstValue : firstValueType
    };
    jQuery(parentId).cascade(options);
	
	
}