function DefaultButton(btn, event) {
	if (document.all) {
		if (event.keyCode == 13) {
			event.returnValue = false;
			event.cancel      = true;
			btn.click();
		}
	}
	else if (document.getElementById) {
		if (event.which == 13) {
			event.returnValue = false;
			event.cancel      = true;
			btn.click();
		}
	}
	else if(document.layers) {
		if(event.which == 13) {
			event.returnValue = false;
			event.cancel      = true;
			btn.click();
		}
	}
}