//########## CENTER POP-UP
//########## EXEMPLO: javascript:janela(250, 200, 'pagina.asp', 'pagina', 'no', 'yes')

function janela(jw,jh,pagina,titulo,barras,modal){

	var sw, sh;

	sw = ((screen.availWidth-jw)/2);
	sh = ((screen.availHeight-jh)/2);

	if ((modal == 'yes') && (navigator.appName == 'Microsoft Internet Explorer')){
		jh = jh + 20;
		window.showModelessDialog(pagina,'','dialogWidth:' + jw + 'px;dialogHeight:' + jh + 'px;center:yes;resizable:no;scroll:' + barras + ';status:no;help:no');
	}else{
		window.open(pagina,titulo,'resizable=no,scrollbars=' + barras + ',width=' + jw + ',height=' + jh + ',left=' + sw + ',top=' + sh);
	}

}