function showLayers() { 
  var i,p,v,obj,args=showLayers.arguments;

  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_findObj(n, d) { 
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function changs(urls,n){
var n;
n=n;
var doc = document.all;
url=urls.split("/");
spnum=url.length;
imgsrc=url[spnum-1].split(".");
if(imgsrc[0].substring(imgsrc[0].length-2)=="_1"){
imgsrc=imgsrc[0].substring(0,imgsrc[0].length-2)+"."+imgsrc[1];
}
else{
imgsrc=imgsrc[0]+"_1."+imgsrc[1];
}
switch (n) { 
   case 1 : 
		doc.head_1.src="img/"+imgsrc;
		break;
   case 2 : 
		doc.head_2.src="img/"+imgsrc;
		break;
   case 3 : 
		doc.head_3.src="img/"+imgsrc;
		break;
   case 4 : 
		doc.head_4.src="img/"+imgsrc;
		break;
   case 5 : 
		doc.head_5.src="img/"+imgsrc;
		break;
   case 6 : 
		doc.head_6.src="img/"+imgsrc;
		break;
   case 7 : 
		doc.head_7.src="img/"+imgsrc;
		break;
} 
}