// open additional window
function MM_openBrWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}


// check to see if something is a number
function checknum(field) {
var valid = "0123456789.";
for (var i=0; i < field.length; i++) {
  temp = "" + field.substring(i, i+1);
  if (valid.indexOf(temp) == "-1") {
    return false;
  }
}
return true;
}


//-----
//checks for valid email
//-----
function isEmail(str) {
  // are regular expressions supported?
  var supported = 0;
  if (window.RegExp) {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported)
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}