var header=new Array("header1.png","header2.png","header3.png","header4.png");
var fade=new Array("fade1.png","fade2.png","fade3.png","fade4.png","fade5.png","fade6.png","fade7.png","fade8.png");

var act_pic=new Array();
act_pic[0]=parseInt(Math.random()*header.length);
act_pic[1]=-1;

function changepic(target,pics,type) {
   if ($("#"+target)) {
      if ((++act_pic[type])>=pics.length) { act_pic[type]=0; }
      $("#"+target).fadeOut("fast",function (){changepicsrc(target,pics,type);});
      setTimeout(function (){changepic(target,pics,type);},5000+(type*1500));
   }
}
function changepicsrc(target,pics,type) {
   $("#"+target).attr("src","site/mpk/images/"+pics[act_pic[type]]);
   $("#"+target).fadeIn("fast");
}

addOnload(function (){changepic("head_banner",header,0);});
addOnload(function (){changepic("animacio",fade,1);});