function Open(pagina, nome, w, h, scroll) {
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;

//var winl = 0;
//var wint = 0;


winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=no'
win = window.open(pagina, nome, winprops)
}


//como utilizar no html
//<a href="http://www.ingames.com.br/rankcs/index.html" onclick="Open2(this.href,'Ranking','750','600','yes');return false;">Ranking</a>