var widthw = 350;
 var heightw = 270;
 var estilo = "resizable=0,menubar=0,toolbar=0,location=0,personalbar=0"+
                 ",status=0,scrollbar=0,width="+widthw+",height="+heightw+",top="+
                 (screen.height-heightw)/2+",left="+(screen.width-widthw)/2;

 function abrir() {
 window.open("http://www.irc-hispano.org/demochat/webchat.html"+                     "?canal=%23Educadores_Cristianos","WebChatIni",estilo);
 }