var img11_on = new Image();
var img11_off = new Image();
var img12_on = new Image();
var img12_off = new Image();
var img13_on = new Image();
var img13_off = new Image();
var img14_on = new Image();
var img14_off = new Image();
var img15_on = new Image();
var img15_off = new Image();
var img16_on = new Image();
var img16_off = new Image();
var img17_on = new Image();
var img17_off = new Image();
var img18_on = new Image();
var img18_off = new Image();
var img19_on = new Image();
var img19_off = new Image();



img11_on.src="images/b_water_b.gif";
img11_off.src="images/b_water_a.gif";

img12_on.src="images/b_mage_b.gif";
img12_off.src="images/b_mage_a.gif";

img13_on.src="images/b_gaiyou_b.gif";
img13_off.src="images/b_gaiyou_a.gif";

img14_on.src="images/b_jouhou_b.gif";
img14_off.src="images/b_jouhou_a.gif";

img15_on.src="images/b_link_b.gif";
img15_off.src="images/b_link_a.gif";

img16_on.src="images/b_shasin_b.gif";
img16_off.src="images/b_shasin_a.gif";


img17_on.src="images/b_map_b.gif";
img17_off.src="images/b_map_a.gif";

img18_on.src="images/b_mail_b.gif";
img18_off.src="images/b_mail_a.gif";

img19_on.src="images/b_top_page_b.gif";
img19_off.src="images/b_top_page_a.gif";


function rollon(targetimage){
　if(targetimage=="image11"){
    document.images[targetimage].src=img11_on.src;
    }
　if(targetimage=="image12"){
    document.images[targetimage].src=img12_on.src;
    }
　if(targetimage=="image13"){
    document.images[targetimage].src=img13_on.src;
    }
　if(targetimage=="image14"){
    document.images[targetimage].src=img14_on.src;
    }
　if(targetimage=="image15"){
    document.images[targetimage].src=img15_on.src;
    }
　if(targetimage=="image16"){
    document.images[targetimage].src=img16_on.src;
    }
　if(targetimage=="image17"){
    document.images[targetimage].src=img17_on.src;
    }
　if(targetimage=="image18"){
    document.images[targetimage].src=img18_on.src;
    }
　if(targetimage=="image19"){
    document.images[targetimage].src=img19_on.src;
    }

  }



function rolloff(targetimage){
　if(targetimage=="image11"){
    document.images[targetimage].src=img11_off.src;
    }
  if(targetimage=="image12"){
    document.images[targetimage].src=img12_off.src;
    }
  if(targetimage=="image13"){
    document.images[targetimage].src=img13_off.src;
    }
  if(targetimage=="image14"){
    document.images[targetimage].src=img14_off.src;
    }
  if(targetimage=="image15"){
    document.images[targetimage].src=img15_off.src;
    }
  if(targetimage=="image16"){
    document.images[targetimage].src=img16_off.src;
    }
  if(targetimage=="image17"){
    document.images[targetimage].src=img17_off.src;
    }
  if(targetimage=="image18"){
    document.images[targetimage].src=img18_off.src;
    }
  if(targetimage=="image19"){
    document.images[targetimage].src=img19_off.src;
    }


  }