need a simple javascript function

  <script language="JavaScript" type="text/javascript">
 function check() {
 
  var items=new Array();
  items[0]="item-1";
  items[1]="item-2";
  items[2]="item-3";
  
  input = document.getElementById("in").value;
  if(input=="") {
   alert("Please enter a value !");
   return;
  }
  
  for(i=0; i<items.length; i++)
   if( input==items ) {
    location.href = "welcome.html";
    return;
   }

  location.href = "rejected.html";
  
 }
  </script>