if (document.images) 
	{
        doc0 = new Image()
        doc0.src = "nr.gif"
	}

function HighLight(i) 
	{
        if (document.images) 
		{
                var thang = document.images[i].src
                var off = thang.lastIndexOf("nr")
                if (off != -1) 
			{
                        document.images[i].src = thang.substring(0,off) + "lt" + ".gif"
	                }
        	}
	}

function Lightsoff(i) 
	{
        if (document.images) 
		{
                var thang = document.images[i].src
                var on = thang.lastIndexOf("lt")
                if (on != -1) 
			{
                        document.images[i].src = thang.substring(0,on) + "nr" + ".gif"         
	       		}
	        }	
	}