function Hide(xfield,opcao){
	if (document.all) {document.all[xfield].style.visibility=(opcao)?  "hidden" : "visible";document.all[xfield].style.display=(opcao)? "none" :"inline";}
    else if (document.layers) {document.layers[xfield].visibility=(opcao)?     "hidden" : "visible";document.layers[xfield].display=(opcao)? "none" :"inline";}
    else if (document.getElementById) {document.getElementById(xfield).style.visibility = (opcao)?     "hidden" : "visible";document.getElementById(xfield).style.display = (opcao)? "none" : "inline";}
}