/**
 * (c) Diego M. García 2008 :: Punt Doc Consultors, S.L.
 */
function AjaxRequest() {
	
	var xmlhttp=false;
 	try {
		
 		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		
 	} catch (e) {
		
 		try {
 			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 		} catch (e2) {
 			xmlhttp = false;
 		}
		
  	}

	if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
 		xmlhttp = new XMLHttpRequest();
	}
	
	return xmlhttp;
}

/**
 * (c) Diego M. García 2008 :: Punt Doc Consultors, S.L.
 */
function getAjaxServerData(url, container, preloader) {

	preloader.style.display = "inline";
	
	ajax = AjaxRequest();
	ajax.open("POST", url, true);
	ajax.onreadystatechange = function() {

		if (ajax.readyState == 1) {
			preloader.innerHTML = "Carregant...&nbsp;<img src=\"icones/ajax-loader.gif\">";
			
		} else if (ajax.readyState == 4) {
		
			if (ajax.status == 200) {
				container.innerHTML = ajax.responseText;
				preloader.style.display = "none";
			} else if (ajax.status == 404) {
				preloader.innerHTML = "La página no existe";
			} else {
				container.innerHTML = ajax.responseText;
				preloader.innerHTML = "Error:" + ajax.status;
			}

		}

	}

	ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	return ajax;	
}

/**
*
*  URL encode / decode
*  http://www.webtoolkit.info/
*
**/

var Url = {

	// public method for url encoding
	encode : function (string) {
		return escape(this._utf8_encode(string));
	},

	// public method for url decoding
	decode : function (string) {
		return this._utf8_decode(unescape(string));
	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";

		for (var n = 0; n < string.length; n++) {

			var c = string.charCodeAt(n);

			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}

		return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while ( i < utftext.length ) {

			c = utftext.charCodeAt(i);

			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}

		}

		return string;
	}

}