function URLEncode(url) 
{
	var SAFECHARS = "0123456789" + // Numeric
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ" + // Alphabetic
	"abcdefghijklmnopqrstuvwxyz" +
	"-_.!~*'()"; // RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var plaintext = url;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) 
	{
		var ch = plaintext.charAt(i);
		if (ch == " ") 
		{
			encoded += "+"; // x-www-urlencoded, rather than %20
		} 
		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;
}