function openAWindow( pageToLoad, winName, width, height, center) {

xposition=0; yposition=0;
if ((parseInt(navigator.appVersion) >= 4 ) && (center)){
xposition = (screen.width - width) / 2;
yposition = (screen.height - height) / 2;
}
args = "width=" + width + "," 
+ "height=" + height + "," 
+ "location=0," 
+ "menubar=0,"
+ "resizable=0,"
+ "scrollbars=0,"
+ "status=0," 
+ "titlebar=0,"
+ "toolbar=0,"
+ "hotkeys=0,"
+ "screenx=" + xposition + "," //NN Only
+ "screeny=" + yposition + "," //NN Only
+ "left=" + xposition + "," //IE Only
+ "top=" + yposition; //IE Only

window.open( pageToLoad,winName,args );
}