function abre(janela,larg,alt){
	window.open(janela, '_blank', 'top='+ parseInt((screen.availHeight/2) - (alt/2))+', left='+ parseInt((screen.availWidth/2) - (larg/2)) +', width='+larg+',height='+alt+',toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no');
}
function abrex(janela,larg,alt){
	window.open(janela, '_blank', 'top='+ parseInt((screen.availHeight/2) - (alt/2))+', left='+ parseInt((screen.availWidth/2) - (larg/2)) +', width='+larg+',height='+alt+',toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no');
}
function abreu(janela,larg,alt){
	window.open(janela, '_blank', 'top=50, left=50, width='+larg+',height='+alt+',toolbar=no,location=no,status=yes,menubar=no,scrollbars=no,resizable=no');
}
function confirma(msg, url){
	if(confirm(msg)) location.href = url;
}