var clickmessage="Right-click disabled on images"
function disableclick(e) 
{
	if (document.all) 
	{
		if (event.button == 2 || event.button == 3) 
		{
			if (event.srcElement.tagName.toLowerCase() == "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.toLowerCase == "img" || e.target == "[object HTMLImageElement]"))
		{
			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()
}