if ( document.images ) {

var menu_1=new Image();

menu_1.src="01_1.jpg";



var menu_1_=new Image();

menu_1_.src="01_2.jpg";



var menu_2=new Image();

menu_2.src="02_1.jpg";



var menu_2_=new Image();

menu_2_.src="02_2.jpg";



var menu_3=new Image();

menu_3.src="03_1.jpg";



var menu_3_=new Image();

menu_3_.src="03_2.jpg";



var menu_4=new Image();

menu_4.src="04_1.jpg";



var menu_4_=new Image();

menu_4_.src="04_2.jpg";



var menu_5=new Image();

menu_5.src="05_1.jpg";



var menu_5_=new Image();

menu_5_.src="05_2.jpg";



var menu_6=new Image();

menu_6.src="06_1.jpg";



var menu_6_=new Image();

menu_6_.src="06_2.jpg";

}

var c;



function Exchange1(arg){

if  (document.images) {

counter = eval ( arg + ".src" );

document[arg].src = counter;

}

}

function Exchange2(arg){

if  (document.images) {

counter = eval ( arg + "_.src" );

document[arg].src = counter;

}

}