var clickmessage="Right click disabled on images!"

function disableclick(e) 
{
	if (document.all) 
	{
		if (event.button==2||event.button==3) 
		{
			if (event.srcElement.tagName=="IMG")
			{
			alert(clickmessage);
			return false;
		   }
	   }
}
else if (document.layers) 
{
	if (e.which == 3) 
	 {
		alert(clickmessage);
		return false;
	}
}

else if (document.getElementById)
{
	if (e.which==3&&e.target.tagName=="IMG")
	{
		alert(clickmessage)
		return false
	}
  }
}

function associateimages()
{
	for(i=0;i<document.images.length;i++)
	document.images[i].onmousedown=disableclick;
}

if (document.all)
document.onmousedown=disableclick
else if (document.getElementById)
document.onmouseup=disableclick
else if (document.layers)
associateimages()