function smartRollover() {
if(document.getElementsByTagName) {
var images = document.getElementsByTagName("img");
for(var i=0; i < images.length; i++) {
if(images[i].getAttribute("src").match("_off."))
{
images[i].onmouseover = function() {
this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
}
images[i].onmouseout = function() {
this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
}
}
}
}
}
if(window.addEventListener) {
window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
window.attachEvent("onload", smartRollover);
}

function randomImg(){
  
   var array = new Array();
   var link_arr = new Array(" ","http://www.shinkin.co.jp/shizuoka/","http://www.entetsu.net/","http://sbs-smc.jp/","http://o-tea.org/","http://www.shizushin.com/shin_top.html","http://www.shinkin.co.jp/shizuoka/");  

  for(var i = 1;i<=5;i++){
    array[i] = i+'.gif';
  }

  var newArr = Array();
     while(true){
  var tag = true;
     var r = Math.ceil(Math.random()*100000);
       var p = r%5+1;
     for(var j=0;j<=newArr.length;j++){
     if(newArr[j]==p){
     tag = false;
     }
  }
  if(tag){
     newArr.push(p);
    
  }
  if(newArr.length>=5){break;}
  }

  for(var j=0;j<4;j++){
    var n = j+1;
    var oTd = document.getElementById("img-"+n);
    oTd.innerHTML = '<a target="_blank" href="'+link_arr[newArr[j]]+'"><img src="'+array[newArr[j]]+'"></a>';
  }
  
  }