function WinOpen(pgname,w,h)
{
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
  window.open(pgname,"Calculator",'resizable,width=270,height=380,top='+wint+',left='+winl+'');
}
function changeColor(obj,altColor)
{
  obj.style.color=altColor;
}
function changeBkgr(obj,sline)
{
  obj.style.textDecoration=sline; 
}
function changeIMG(obj,altIMG)
{
  obj.src=altIMG;
}
function WinOpenAlt(pgname,w,h,t,wt,ht)
{
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
  window.open(pgname,t,'resizable,width='+wt+',height='+ht+',top='+wint+',left='+winl+'');
}
function chgDiv(cDiv,b,c,d)
{
 b.style.display = "none";
 c.style.display = "none";
 d.style.display = "none";
 //e.style.display = "none";
 cDiv.style.display = "block";
 cDiv.style.visibility = "visible";
}