if(document.images){
    var img01_on=new Image();
    var img01_off=new Image();
    var img02_on=new Image();
    var img02_off=new Image();
    var img03_on=new Image();
    var img03_off=new Image();
    var img04_on=new Image();
    var img04_off=new Image();
    var img05_on=new Image();
    var img05_off=new Image();
    var img06_on=new Image();
    var img06_off=new Image();
    var img07_on=new Image();
    var img07_off=new Image();
    var img08_on=new Image();
    var img08_off=new Image();
    var img09_on=new Image();
    var img09_off=new Image();
    var img10_on=new Image();
    var img10_off=new Image();
    var img11_on=new Image();
    var img11_off=new Image();
}

function preLoad(){
        img01_on.src="images/menu/sweet.gif";
        img01_off.src="images/menu/sweet_on.gif";
        img02_on.src="images/menu/sweet_j.gif";
        img02_off.src="images/menu/sweet_j_on.gif";
        img03_on.src="images/menu/season.gif";
        img03_off.src="images/menu/season_on.gif";
        img04_on.src="images/menu/material.gif";
        img04_off.src="images/menu/material_on.gif";
        img05_on.src="images/menu/tool.gif";
        img05_off.src="images/menu/tool_on.gif";
        img06_on.src="images/menu/print.gif";
        img06_off.src="images/menu/print_on.gif";
        img07_on.src="images/menu/event.gif";
        img07_off.src="images/menu/event_on.gif";
        img08_on.src="images/menu/recipe.gif";
        img08_off.src="images/menu/recipe_on.gif";
        img09_on.src="images/menu/question.gif";
        img09_off.src="images/menu/question_on.gif";
        img10_on.src="images/menu/company.gif";
        img10_off.src="images/menu/company_on.gif";
        img11_on.src="images/menu/home.gif";
        img11_off.src="images/menu/home_on.gif";
}

function changeImage1(){
    document.sweet.src="images/menu/sweet_on.gif";
}
function changeImage2(){
    document.sweet.src="images/menu/sweet.gif";
}
function changeImage3(){
    document.sweet_j.src="images/menu/sweet_j_on.gif";
}
function changeImage4(){
    document.sweet_j.src="images/menu/sweet_j.gif";
}
function changeImage5(){
    document.season.src="images/menu/season_on.gif";
}
function changeImage6(){
    document.season.src="images/menu/season.gif";
}
function changeImage7(){
    document.material.src="images/menu/material_on.gif";
}
function changeImage8(){
    document.material.src="images/menu/material.gif";
}
function changeImage9(){
    document.tool.src="images/menu/tool_on.gif";
}
function changeImage10(){
    document.tool.src="images/menu/tool.gif";
}
function changeImage11(){
    document.print.src="images/menu/print_on.gif";
}
function changeImage12(){
    document.print.src="images/menu/print.gif";
}
function changeImage13(){
    document.event.src="images/menu/event_on.gif";
}
function changeImage14(){
    document.event.src="images/menu/event.gif";
}
function changeImage15(){
    document.recipe.src="images/menu/recipe_on.gif";
}
function changeImage16(){
    document.recipe.src="images/menu/recipe.gif";
}
function changeImage17(){
    document.question.src="images/menu/question_on.gif";
}
function changeImage18(){
    document.question.src="images/menu/question.gif";
}
function changeImage19(){
    document.company.src="images/menu/company_on.gif";
}
function changeImage20(){
    document.company.src="images/menu/company.gif";
}
function changeImage21(){
    document.home.src="images/menu/home_on.gif";
}
function changeImage22(){
    document.home.src="images/menu/home.gif";
}