function setCookie( name, value, expiredays ) {
   var todayDate = new Date();
   todayDate.setDate( todayDate.getDate() + expiredays );
   document.cookie = name + "=" + escape( value ) + "; path=/; expires=" + todayDate.toGMTString() + ";"
}

function getCookie(str) {
   var key = str + "=" ;
   var key_len = key.length ;
   var cookie_len = document.cookie.length;
   var i = 0;
   while (i < cookie_len ) {
	  var j = i + key_len;
	  if ( document.cookie.substring( i, j ) == key ) {
		 var cookie_end = document.cookie.indexOf(";",j);
		 if (cookie_end == -1) {
			cookie_end = document.cookie.length;
		 }
		 return document.cookie.substring(j,cookie_end );
	  }
	  i++
   }
   return ""
}

function DeleteCookie (name) {  
   var exp = new Date();  
   exp.setTime (exp.getTime() - 1);  
   var cval = getCookie (name);  
   document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}