var doPopUp3X = (screen.width/2)-310;
var doPopUp3Y = (screen.height/2)-300;
var pos = "left="+doPopUp3X+",top="+doPopUp3Y;

function doPopUp3(){
doPopUp3Window = window.open("formnewsletter.html","newsletterform","scrollbars=yes,width=640,height=500,"+pos);
}