nav1on=preload("http://www.magic-man.com/image/1on.gif"); nav1off=preload("http://www.magic-man.com/image/1off.gif");
nav2on=preload("http://www.magic-man.com/image/2on.gif"); nav2off=preload("http://www.magic-man.com/image/2off.gif");
nav3on=preload("http://www.magic-man.com/image/3on.gif"); nav3off=preload("http://www.magic-man.com/image/3off.gif");
nav4on=preload("http://www.magic-man.com/image/4on.gif"); nav4off=preload("http://www.magic-man.com/image/4off.gif");
nav5on=preload("http://www.magic-man.com/image/5on.gif"); nav5off=preload("http://www.magic-man.com/image/5off.gif");
nav6on=preload("http://www.magic-man.com/image/6on.gif"); nav6off=preload("http://www.magic-man.com/image/6off.gif");
nav7on=preload("http://www.magic-man.com/image/7on.gif"); nav7off=preload("http://www.magic-man.com/image/7off.gif");

function preload(img) 
{
  var a=new Image(); a.src=img; return a; 
}

function imageSwapOn(tab) {
    imgOn=eval("nav" + tab + "on.src");
	document.getElementById(tab).src=imgOn;
	}
function imageSwapOff(tab) {
    imgOff=eval("nav" + tab + "off.src");
	document.getElementById(tab).src=imgOff;
	}