var url=new Array("main","main","main","main","main","main");//リンク先
var img=new Array("data/top1_off","data/top2_off","data/top3_off","data/top4_off","data/top5_off","data/top6_off");//イメージurl
var old=new Array("data/top1_on","data/top2_on","data/top3_on","data/top4_on","data/top5_on","data/top6_on");//マウスオーバー時のイメージurl
var txt=new Array("白ゆり総合リハケアクリニック","白ゆり総合リハケアクリニック","白ゆり総合リハケアクリニック","白ゆり総合リハケアクリニック","白ゆり総合リハケアクリニック","白ゆり総合リハケアクリニック");//altの内容

function imgon(obj,num){
obj.src=old[num]+".jpg";
}

function imgoff(obj2,num2){
obj2.src=img[num2]+".jpg";
}

function entrance(){
var x=Math.floor(Math.random()*url.length);
document.write('<a href="'+url[x]+'.html"><img src="'+img[x]+'.jpg" alt="'+txt[x]+'"border=0 onmouseover="imgon(this,'+x+')" onmouseout="imgoff(this,'+x+')"></a>');
}
entrance();