function initRollOverImages() {
  var image_cache = new Object();
  $("img.swap").each(function(i) {
    var imgsrc = this.src;
    var dot = this.src.lastIndexOf('.');
    var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
    image_cache[this.src] = new Image();
    image_cache[this.src].src = imgsrc_on;
    $(this).hover(
      function() { this.src = imgsrc_on; },
      function() { this.src = imgsrc; });
  });
}

$(document).ready(initRollOverImages);

function changeImages(inputData) {
if ( inputData=='0' ) { document.floor_2f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_2f_1_on.gif' ; }
if ( inputData=='1' ) { document.floor_2f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_2f_2_on.gif' ; }
if ( inputData=='2' ) { document.floor_2f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_2f.gif' ; }
if ( inputData=='3' ) { document.floor_3f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_3f_1_on.gif' ; }
if ( inputData=='4' ) { document.floor_3f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_3f_2_on.gif' ; }
if ( inputData=='5' ) { document.floor_3f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_3f_3_on.gif' ; }
if ( inputData=='6' ) { document.floor_3f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_3f_4_on.gif' ; }
if ( inputData=='7' ) { document.floor_3f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_3f.gif' ; }
if ( inputData=='8' ) { document.floor_4f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_4f_1_on.gif' ; }
if ( inputData=='9' ) { document.floor_4f.src = 'http://www.yaf.or.jp/yoshino/images/floormap_4f.gif' ; }}