var ie = (document.all)? true : false;
var nn6 = (!ie && document.getElementById)? true : false;
var nn4 = (document.layers)? true : false;

function popupWin(name, uri) {
	var posCode = ''
	var wdt = '700'
	var hgt = '400'
    if (nn4 || nn6 || ie) {
        posX = Math.round((screen.width - wdt) / 2);
        posY = Math.round((screen.height - hgt) / 2);

        if ( (screen.height < 601) && (hgt > 550) ) { hgt = 570 }
        if ( (screen.height < 481) && (hgt > 430) ) { hgt = 430 }

        posCode = (nn4 || nn6)? ",screenX="+posX+",screenY="+posY : ",left="+posX+",top="+posY;
    }
    popupedWin = window.open(
        uri, name,
        "status=yes,menubar=no,toolbar=no,resizable=yes,scrollbars=yes,location=no,"+
        "width="+wdt+",height="+hgt+posCode);
    popupedWin.focus();
    return false;
}