var displayBlock;
var dWidth = screen.width;
var dHeight = screen.height;
var sSize;
var sWidth;
var sHeight;
var ratio = (dWidth / dHeight).toPrecision(5);
var dRatio = Math.sqrt((dWidth*dWidth)+(dHeight*dHeight));

switch (true)
{
case (ratio>=0.5600 && ratio<=0.5700):
  ratio = "9:16";
  break
case (ratio == 0.6000):
  ratio = "3:5";
  break
case (ratio == 0.6250):
  ratio = "10:16";
  break
case (ratio>=0.6427 && ratio<=0.6429):
  ratio = "9:14";
  break
case (ratio>=0.6665 && ratio<=0.6667):
  ratio = "2:3";
  break
case (ratio == 0.7500):
  ratio = "3:4";
  break
case (ratio == 0.8000):
  ratio = "4:5";
  break
case (ratio == 1.3333):
  ratio = "4:3";
  break
case (ratio == 1.6000):
  ratio = "16:10";
  break
case (ratio == 1.2500):
  ratio = "5:4";
  break
case (ratio == 1.6666):
  ratio = "5:3";
  break
case (ratio>=1.5500 && ratio<=1.5700):
  ratio = "14:9";
  break
case (ratio>=1.7700 && ratio<=1.7800):
  ratio = "16:9";
  break
case (ratio>=1.4980 && ratio<=1.5000):
  ratio = "3:2";
  break
}

document.write('ViewGuard&#174; has detected that your display has a <b>'+ratio+' Aspect Ratio</b>. Click <a href=display-calculator.php>here</a> to find out more.');