function URLEncode (clearString) {

	var output = '';	
	var x = 0;
	
	clearString = clearString.toString();
	
	var regex = /(^[a-zA-Z0-9_.]*)/;
	
	while (x < clearString.length) {
	
		var match = regex.exec(clearString.substr(x));
		
		if (match != null && match.length > 1 && match[1] != '') {		
			output += match[1];			
			x += match[1].length;		
		} 
		else {		
			if (clearString[x] == ' ')			
				output += '%20';
			
			else {			
				var charCode = clearString.charCodeAt(x);			
				var hexVal = charCode.toString(16);			
				output += '%' + ( hexVal.length < 2 ? '0' : '' ) + hexVal.toUpperCase();		
			}			
			x++;		
		}	
	}
	
	return output;

}