var doPopUpX = (screen.width/2)-225;
var doPopUpY = (screen.height/2)-250;
var pos = "left="+doPopUpX+",top="+doPopUpY;
function doPopUp1(){
doPopUpWindow = window.open("http://mbcosmeticderm.com/coupon.htm","coupon","width=540,height=550,"+pos);
}