e has no properties trying to get the mouse coordinates on an image click

Hi all,

I'm using the following code to get the mouse coordinates on an image click event.  Works fine in IE, gives the following in NS and FF

e has no properties

here's the code:

function getMouse(e) {
      var posx = 0;
      var posy = 0;
      if (!e) var e = window.event;
      alert(e); //returns undefined
      if (e.pageX || e.pageY)
      {
            posx = e.pageX;
            posy = e.pageY;
      }
      else if (e.clientX || e.clientY)       
      {
            posx = e.clientX + document.body.scrollLeft      + document.documentElement.scrollLeft;
            posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
      }
      
      mouseX = posx;
      mouseY = posy;
      // posx and posy contain the mouse position relative to the document
      // Do something with this information
}

So what am I doing wrong?

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