function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1 ;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return ""
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : "; expires="+exdate.toGMTString());
}

function checkCookie()
{
username=getCookie('username');
if (username!=null && username!="")
  {
  //alert('Welcome again '+username+'!');
  }
else 
  {
  username=prompt('Please enter your name:',"");
  if (username!=null && username!="")
    {
    setCookie('username',username,365);
    }
  }
}

function salir(){
	 //window.close();
	close();
	
}


function getBG(x)
{
	
     switch(x)
     {
          case 1600:
               document.body.background = "1600.jpg"
               break;

          case 1280:
               document.body.background = "1280.jpg"
               break;

          case 1024:
               document.body.background = "img/home/1024.jpg"
               break;

          case 800:
          	
               document.body.background = "img/home/800.jpg"
               break;

          case 640:
               document.body.background = "640.jpg"
               break;
          
     }
}