//impede o f5
function badEngineering()
{
	var tecla=window.event.keyCode;
	if (tecla==116) {
		if (!window.confirm("Deseja realizar logoff?")){	
			event.keyCode=0;
			event.returnValue=false;
		}
	}
}
//enter automático
function keyDown(DnEvents) {
	if (window.event.keyCode == 13) {
		valida();
	}
}
function mapaSite(){
	window.open('mapasite.html','mapasite','location=no,width=460,height=550,top=0,left=0,scrollbars=YES,resizable=yes');
}
function favorito(){
	window.external.AddFavorite(top.location.href,document.title);
}
function paginaPrincipal(){
	this.style.behavior='url(#default#homepage)'; this.setHomePage('http://www.gdrsigma.com.br');
}