var doPopUp4X = (screen.width/2)-310;
var doPopUp4Y = (screen.height/2)-300;
var pos = "left="+doPopUp4X+",top="+doPopUp4Y;

function doPopUp4(){
doPopUp4Window = window.open("formdonations.html","donationsform","scrollbars=yes,width=640,height=500,"+pos);
}