var specialcase = ((navigator.userAgent.indexOf('Mac') != -1) || document.all)
var flag = 0;
var msg = 'This image is protected by copyright.\nWe request you not to copy it.';
var x,y,x1,y1,copyAttempt;

function init()
{
   if (!(document.getElementById || document.all || document.layers)) return;
   if (specialcase && document.layers)
   {
          document.captureEvents(Event.MOUSEMOVE);
          document.onmousemove = special;
   }
   for (i=0;i<document.images.length;i++)
   {
          document.images[i].onmousedown = checkIt;
          document.images[i].onmouseup = function() {return false};
          if (specialcase)
          {
                  document.images[i].onmousemove = special;
                  document.images[i].onclick = clearIt;
          }
   }
}

function checkIt(e)
{
   copyAttempt = 0;
   if (window.Event)
   {
          x = e.screenX;
          y = e.screenY;
          theButt = (e.which == 3);
   }
   else
   {
          x = window.event.clientX;
          y = window.event.clientY;
          theButt = (window.event.button == 2);
   }
   if (theButt)
   {
          copyAttempt = 1;
          flag = 0;
          alert(msg);
          return false; // NN4 only
   }
   if (specialcase) flag = 1;
   return false;
}

function special(e)
{
   theObj = '';
   if (window.Event)
   {
          x1 = e.screenX;
          y1 = e.screenY;
          if (e.target.parentNode) theObj = e.target.parentNode.tagName;
   }
   else
   {
          x1 = window.event.clientX;
          y1 = window.event.clientY;
          theObj = window.event.srcElement.parentElement.tagName;
   }
   var isLink = (theObj == 'A');
   if (flag && (!isLink || ((Math.abs(x-x1) > 10) || (Math.abs(y-y1) > 10))))
   {
          copyAttempt = 1;
          flag = 0;
          alert(msg);
          return false;
   }
}

function clearIt()
{
   flag = 0;
   if (copyAttempt)
   {
          copyAttempt = 0;
          return false;
   }
}