function getQueryStringVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  }
}

function trim(string){ return string.replace(/(^\s+)|(\s+$)/g, ""); }

function empty(string){
	if(string == "")
		return true;
	return false;
}