/* ----------------------------------------------------------------------------------------
Graceful E-Mail Obfuscation - JavaScript function (decodes e-mail addresses)
Last updated: July 31th, 2007 by Roel Van Gils
----------------------------------------------------------------------------------------
window.onload = function() {
	geo();
}//end fn
 */
 
/**
 * FUNCTION geo()
 *
 */
function geo() {

	if (!document.getElementsByTagName) { // Check for browser support

		return false;
	} else {

		var links = document.getElementsByTagName('a'); 	// Get all anchors
		for (var l=0; l<links.length; l++) { 				// Loop through the anchors
			
			// all modified email-links take rel="nofollow", only these have to be checked/decrypt 
			// restricted to relevant links in order to enhance loading speed
			if (links[l].getAttribute('rel')=="nofollow") { 
				
				/** decrypt addresses */
				geo_decode(links[l]);
			
			}//end if
		}//end for
	}//end if
}//end fn


/**
 * FUNCTION geo_decode()
 *
 */
function geo_decode(anchor) { // function to recompose the orginal address
	
	// tooltips
	
	var tooltip_js_on = "Send Email";
	var tooltip_js_off = "Reveal Email";	
	var map = rot13init();
	//alert(anchor.getAttribute('href'));
	var href = 			anchor.getAttribute('href');
	//var href = 			href.replace(/(%C3%B6)/g,'ö'); // relevante umlautdomains beruecksichtigen (nicht mit decodeURI, da von Opera 5 nicht interpretiert)
	//var href = 			href.replace(/%C3%A4/g,'ä');
	//var href = 			href.replace(/%C3%BC/g,'ü');
	//var href = 			decodeURI(href); // browser support >= FF 1, N 4, IE 5.5
	var address = 		href.replace(/.*stcatnoc\/([A-Za-z0-9\.\%\!\#\$\&\'\*\+\-\?\=\^\_\`\{\|\}]+)\~([a-z0-9._%-àáâãäåāăąæçćĉċčďđèéêëēĕėęěŋðĝğġģĥħìíîïĩīĭįıĵķĸĺļľłñńņňòóôõöøōŏőœŕŗřśŝşšţťŧþùúûüũūŭůűųŵýÿŷźżž]+)\~([a-z.]+)/i, '$1' + '@' + '$2' + '.' + '$3');
	var linktext_new = 	href.replace(/(.*stcatnoc\/)([A-Za-z0-9\.\%\!\#\$\&\'\*\+\-\?\=\^\_\`\{\|\}]+)\~([a-z0-9._%-àáâãäåāăąæçćĉċčďđèéêëēĕėęěŋðĝğġģĥħìíîïĩīĭįıĵķĸĺļľłñńņňòóôõöøōŏőœŕŗřśŝşšţťŧþùúûüũūŭůűųŵýÿŷźżž]+)\~([a-z.]+)/i, '$2' + '@' + '$3' + '.' + '$4');
	var linktext = 		anchor.innerHTML; // IE Fix
	
	if (href != address) {
	
		// replace decrypted url with mailto plus original e-mail address
		anchor.setAttribute('href','mailto:' + str_rot13(address,map)); // Add mailto link	
		
		// the placeholder is being erplaced by the decrypted e-mail address (anchor text, visible, clickable text)
		if (!linktext.search(/(E-Mail)/i)) {
			linktext = str_rot13(linktext_new,map);
		}//end if
		anchor.innerHTML = linktext; // IE Fix
		
		/** change tooltip (tooltip is set to none-js-version per default and altered via these lines) */
		anchor.setAttribute('title',tooltip_js_on); 		// Display tooltip when links are hovered
	}//end if
	
}//end fn
	

/**
 * FUNCTION rot13init()
 *
 */
function rot13init() {
	var map = new Array();
	var s = "abcdefghijklmnopqrstuvwxyz";
	for (var i = 0 ; i < s.length ; i++)
		map[s.charAt(i)] = s.charAt((i+13)%26);
	for (var i = 0 ; i < s.length ; i++)
		map[s.charAt(i).toUpperCase()] = s.charAt((i+13)%26).toUpperCase();
	return map;
}//end fn


/**
 * FUNCTION str_rot13()
 *
 */
function str_rot13(a,map) {
	var s = "";
	for (var i = 0 ; i < a.length ; i++) {
		var b = a.charAt(i);
		s += (b>='A' && b<='Z' || b>='a' && b<='z' ? map[b] : b);
	}//end for
	return s;
}//end fn