function URLEncode(plaintext)
{
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	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);
			}
		}
	} // for

	
	return encoded;
};

function URLDecode(encoded)
{
   // Replace + with ' '
   // Replace %xx with equivalent character
   // Put [ERROR] in output if %xx is invalid.
   var HEXCHARS = "0123456789ABCDEFabcdef"; 
   var plaintext = "";
   var i = 0;
   while (i < encoded.length) {
       var ch = encoded.charAt(i);
	   if (ch == "+") {
	       plaintext += " ";
		   i++;
	   } else if (ch == "%") {
			if (i < (encoded.length-2) 
					&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
					&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				alert( 'Bad escape combination near ...' + encoded.substr(i) );
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	} // while
   
   return plaintext;
};

function getxmlfile(url) {

	xmlhttp=null;
	if (window.XMLHttpRequest){			// code for Mozilla, etc.
		xmlhttp=new XMLHttpRequest();
		
	}else if (window.ActiveXObject){	// code for IE
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	if (xmlhttp!=null){
		
		xmlhttp.open("GET", url, false)
		xmlhttp.send("")
		xmlDoc=xmlhttp.responseText
		
		if (window.ActiveXObject){		// code for IE
			var doc=new ActiveXObject("Microsoft.XMLDOM");
			doc.async="false";
			doc.loadXML(xmlDoc);
		
		}else{							// code for Mozilla, Firefox, Opera, etc.
			var parser=new DOMParser();
			var doc=parser.parseFromString(xmlDoc,"text/xml");
		
		}
		return doc;
	}else{
		alert("Your browser does not support XMLHTTP.");
	}
}

function getxmlfiletext(url){
	xmlhttp=null;
	if (window.XMLHttpRequest){			// code for Mozilla, etc.
		xmlhttp=new XMLHttpRequest();
		
	}else if (window.ActiveXObject){	// code for IE
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	if (xmlhttp!=null){
		
		xmlhttp.open("GET", url, false)
		xmlhttp.send("")
		return xmlhttp.responseText
		
	}else{
		alert("Your browser does not support XMLHTTP.");
		return "";
	}

}
function state_Change() {

	if (xmlhttp.readyState==4){			// if xmlhttp shows "loaded"
	  if (xmlhttp.status!=200){			// if "NOT OK"
	    	alert("Problem retrieving XML data");
	  }
	}
}