function preview(type, id)
{
    window.open('Preview' + type + '.aspx?id=' + id, 'preview' + type);
}

function positionOverlay()
{
    configurePositionOverlayTimer();
}

function doPositionOverlay()
{
    var o = document.getElementById("overlay");
    o.style.top = alertSize() - 60;
    
    // ok...
    configurePositionOverlayTimer();
}

function configurePositionOverlayTimer()
{
    window.setTimeout("doPositionOverlay();", 500);
}

function alertSize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  return myHeight;
 }