function executeIdSearch(input_field) {
  if (/[0-9]+/i.exec(input_field.val()) == null) {
    alert('Please enter a valid Property ID e.g. 1234567');
  } else {
    document.location = '/properties/'+ input_field.val()+'/details' ;
  };
  return false;
}

sfHover = function() {
	var sfEls = document.getElementById("navigation").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}