$(function(){
$("img[src='usr/images/menu1.jpg']").mouseover(function(){
$(this).attr("src","usr/images/menu1_on.jpg")
}).mouseout(function(){
$(this).attr("src","usr/images/menu1.jpg")
})

$("img[src='usr/images/menu2.jpg']").mouseover(function(){
$(this).attr("src","usr/images/menu2_on.jpg")
}).mouseout(function(){
$(this).attr("src","usr/images/menu2.jpg")
})

$("img[src='usr/images/menu3.jpg']").mouseover(function(){
$(this).attr("src","usr/images/menu3_on.jpg")
}).mouseout(function(){
$(this).attr("src","usr/images/menu3.jpg")
})

$("img[src='usr/images/menu4.jpg']").mouseover(function(){
$(this).attr("src","usr/images/menu4_on.jpg")
}).mouseout(function(){
$(this).attr("src","usr/images/menu4.jpg")
})

$("img[src='usr/images/menu5.jpg']").mouseover(function(){
$(this).attr("src","usr/images/menu5_on.jpg")
}).mouseout(function(){
$(this).attr("src","usr/images/menu5.jpg")
})
})