function URLEncode(str) {
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";
	var plaintext = str;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";	// x-www-urlencoded, rather than 
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert("Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted.");
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	}
	return encoded;
}

function chkContactForm() {
  if (document.ff.ifirst_name.value == "") {
    alert("Please enter your first name.");
    document.ff.ifirst_name.focus();
    return false;
  }
  else if (document.ff.ilast_name.value == "") {
    alert("Please enter your last name.");
    document.ff.ilast_name.focus();
    return false;
  }
  else if (document.ff.iphone.value == "") {
    alert("Please enter your phone.");
    document.ff.iphone.focus();
    return false;
  }
  else if (document.ff.iemail.value.indexOf('@') <= 0) {
    alert("Please enter a valid email address.");
    document.ff.iemail.focus();
    document.ff.iemail.select();
    return false;
  }
  else if (document.ff.recaptcha_response_field.value == "") {
    alert("Please enter the words you see.");
    document.ff.recaptcha_response_field.focus();
    return false;
  }
  else {
    document.ff.subtn.value = "Sending...please wait";
    document.ff.subtn.disabled = true;
  	return true;
  }
}