function myReplace(s, s1, s2) {

	var n = s.length;

	var n1 = s1.length;

	var n2 = s2.length;



	var j = 0;

	var i = s.indexOf( s1, j);



	while ( typeof i == "number" && i != -1 ) {

		s = s.substring( 0, i ) + s2 + s.substring( i+n1 , n );

		n += (n2 - n1);

		j = i+n2;

		i = s.indexOf( s1, j);

	}

	return s;

}



function isEmpty(value){

	return (myReplace(value, " ", "").length==0);

}



function escapeAmpersands(s) {

	return myReplace(s, "&", "&&" );

}



function unescapeAmpersands(s) {

	return myReplace(s, "&&", "&" );

}



function myRequest( sQueryString ) {

	this.keys = new Array();

	if ( sQueryString == null) {

		return;

	}

	var sKey = '';

	var n = 0;

	var s = unescape( sQueryString );

	if ( s.substring(0,1) == '?' ) {

		s = s.substring(1, s.length );

	}

	

	var i;

	var j;

	var k;



	i = 0;

	while (true) {

		j = s.indexOf('=', i);

		if (typeof j != "number" || j == -1) {

			return;

		}

		k = s.indexOf('&', j+1);

		if ( typeof k != "number" || k == -1 ) {

			k = s.length;

		}

		else {

			while ( s.substring(k+1,k+2) == '&' ) {

				k = s.indexOf('&', k+2);

				if ( typeof k != "number" || k == -1 ) {

					k = s.length;

					break;

				}

			}

		}

		sKey = s.substring(i,j);

		this[ sKey ] = unescapeAmpersands( s.substring(j+1,k) );

		this.keys[n++] = sKey;

		i = k+1;

	}

}



myRequest.prototype.toQueryString = toQueryString_myRequest;

myRequest.prototype.add = add_myRequest;

myRequest.prototype.merge = merge_myRequest;



function add_myRequest( sKey, sValue) {

	if ( this[ sKey ] == null ) {

		this.keys[ this.keys.length ] = sKey;

	}

	this [ sKey ] = sValue;

}



function toQueryString_myRequest() {

	var s = '?';

	var n = this.keys.length;

	for ( var i = 0; i < n; i++ ) {

		var sKey = this.keys[i];

		s += escapeAmpersands( sKey + '=' + this[ sKey ] );

		if ( i < (n-1) ) {

			s += '&';

		}

	}

	return s;

}



// If a key already exists, its value will be overwritten 

function merge_myRequest( oRequest ) {

	if ( oRequest != null && oRequest.keys != null ) {

		var n1 = this.keys.length;

		var n2 = oRequest.keys.length;

		for ( var i = 0; i < n2; i++ ) {

			var sKey = oRequest.keys[i];

			var sValue = oRequest[ sKey ];

			if ( this[ sKey ] == null ) {

				this.keys[ n1++ ] = sKey;

			}

			this [ sKey ] = sValue;

		}

	}

}