var isDOM = (window.addEventListener);

if ( isDOM ) 
{
	document.onmouseup = function(e)
	{
		if ( e.which == 3 )
		{
			if ( e.target.form == undefined )
			{
				//alert("menu");
				e.stopPropagation();
				e.preventDefault();
				return( false );
			}
		}
	}
} else {
	document.oncontextmenu = function()
	{
		if ( event.srcElement.form == undefined )
		{
			event.cancelBubble = true;
			event.returnValue = false;
			return( false );
		}
	}
}