var nav01,nav02,nav03,nav04;
					
			if (document.images){	
			imag = new Array();
			
				imag[0] = "images/navbar/nav01.gif";
				imag[1] = "images/navbar/nav01_on.gif";
				imag[2] = "images/navbar/nav01_alt.gif";
			
				
				imag[3] = "images/navbar/nav02.gif";
				imag[4] = "images/navbar/nav02_on.gif";
				imag[5] = "images/navbar/nav02_alt.gif";
				
				imag[6] = "images/navbar/nav03.gif";
				imag[7] = "images/navbar/nav03_on.gif";
				imag[8] = "images/navbar/nav03_alt.gif";
				
				imag[9] = "images/navbar/nav04.gif";
				imag[10] = "images/navbar/nav04_on.gif";
				imag[11] = "images/navbar/nav04_alt.gif";

				
				im = new Array();
				for (var i = 0; i < imag.length; i++)
				{
				im[i] = new Image();
				im[i].src = imag[i];
				}
				}
			
			
			function toggleImage(imgName,num){	
				if (document.images && imgName){
					imgName.src = im[num].src;
					}
				return;
			}