function clearSpaces(str) {
	var ch;
	var strOut = "";

	for (var i = 0; i < str.length; i++) {
		// walk through the string and remove all non-digits
		ch = str.charAt(i);
		if (ch==' ') 
			strOut += '%20'
		else
			strOut += ch;
	}

	return strOut;
}