function check_for_comparison(id) {
    var cookie_splits = document.cookie.split(';');
    var comparisons = '';
    for (var k = 0; k < cookie_splits.length; k++) {
      var value_splits = cookie_splits[k].split('=');
      if (value_splits[0] == ' FND_CMP_CHK' || value_splits[0] == 'FND_CMP_CHK') {
        comparisons = value_splits[1];
      }
    } 
    var splits = comparisons.split(',');
    var exists = 0;
    var new_splits = new Array();
    for (var k = 0; k < splits.length; k++) {
      if (splits[k] != id) {
        if (splits[k] != 0) {
          new_splits.push(splits[k]);
        }
      } else {
        exists = 1;
      }
    } 
    if (exists == 0) {
      new_splits.push(id);
    }
    if (new_splits.length > 4) {
      var element = document.getElementById('check'+new_splits[0]);
      if (element) {
        element.checked = false;
      } 
      new_splits[0] = 0;
    }    
    var join = new_splits.join(',');
    if (join == '') {
    	join = '0';
    }
    document.cookie = "FND_CMP_CHK="+join+"; path=/";
  }

  function check_cookie() {
  	alert(document.cookie);
  }