function SetOpacity(elem, opacityAsInt)
{
var opacityAsDecimal = opacityAsInt;
  
if (opacityAsInt > 100)
       opacityAsInt = opacityAsDecimal = 100; 
   else if (opacityAsInt < 0)
        opacityAsInt = opacityAsDecimal = 0; 
    
    opacityAsDecimal /= 100;
    if (opacityAsInt < 1)
        opacityAsInt = 1; // IE7 bug, text smoothing cuts out if 0
    
    elem.style.opacity = (opacityAsDecimal);
    elem.style.filter  = "alpha(opacity=" + opacityAsInt + ")";
}