YAHOO.namespace("example.overlay");

function initVehicleSelect() {
	YAHOO.example.overlay.dialog1 = new YAHOO.widget.Dialog("vehicleoverlay", 
							{ width : "22em",
							  fixedcenter : true,
							  visible : false,
							  modal:true,
							  close:true,							  
							  constraintoviewport : true
							});

	YAHOO.example.overlay.dialog1.render();
}

function showOverlay() {
    YAHOO.example.overlay.dialog1.show();
}