//commmon scripts cut into external file			
					
var navState = "off"
		
function	swap(imgName)	{
					if (navState == "off"){
						eval("document.images." + imgName + ".src = 'images/nav/nav_" + imgName + "-on.gif'");
						navState = "on"
						}
					
					else	{
						eval("document.images." + imgName + ".src = 'images/nav/nav_" + imgName + "-off.gif'");
						navState = "off"
						}
				}