pic1on= new Image();
pic1on.src="images/home_menu1_on.gif";  

pic2on= new Image();
pic2on.src="images/home_menu2_on.gif";

pic3on= new Image();
pic3on.src="images/home_menu3_on.gif";

pic4on= new Image();
pic4on.src="images/home_menu4_on.gif";

pic5on= new Image();
pic5on.src="images/home_menu5_on.gif";

pic6on= new Image();
pic6on.src="images/home_menu6_on.gif";  	 

pic1off= new Image();
pic1off.src="images/home_menu1_off.gif";  

pic2off= new Image();
pic2off.src="images/home_menu2_off.gif"; 

pic3off= new Image();
pic3off.src="images/home_menu3_off.gif"; 

pic4off= new Image();
pic4off.src="images/home_menu4_off.gif";

pic5off= new Image();
pic5off.src="images/home_menu5_off.gif"; 

pic6off= new Image();
pic6off.src="images/home_menu6_off.gif";

function lightup(imgName) {
      imgOn=eval(imgName + "on.src")
      document.images[imgName].src= imgOn
}

function turnoff(imgName) {
      imgOff=eval(imgName + "off.src")
      document.images[imgName].src= imgOff
}