/***************************************
 replace specified images with SVG images
Written by Alexis "Fyrd" Deveria, 11/28/2007
            Version 1.0
****************************************

Please see http://my.opera.com/Fyrd/blog/svg-image-and-background-image-replacer for details and a demo of this script
License: http://creativecommons.org/licenses/LGPL/2.1/

*/

var SVGDowngrade = new Class({
    Implements: Options,
    options: {},
    initialize: function(options){
        this.svgReplace();
    },
    
    svgReplace: function() {
	var testImg = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNzUiIGhlaWdodD0iMjc1Ij48L3N2Zz4%3D';
	var img = document.createElement('img')
	img.setAttribute('src',testImg);
	if(img.complete) {
		img.style.visibility='hidden';
		img.style.position='absolute';
		document.body.appendChild(img);
		
		window.setTimeout(function() {
			if(img.width >= 100) {
				document.body.removeChild(img);
				this.setCSS();
			} else {
				document.body.removeChild(img);
			}	
		},1);
		
	} else {
		img.onload = this.setCSS;
                //this.setCSS();
	}
    },
    
    setCSS: function() {
	var imgExt = 'svg';
	var dotted = '.'+imgExt+'.';
	var regexp = new RegExp ("(\\."+imgExt+")\\.\\w*([\\W]*)","i");
	if(document.styleSheets) {
	    var ss=document.styleSheets;
	    for(var i=0;i<ss.length;i++) {
		var sh=ss[i];
		var rules = (sh.cssRules)?sh.cssRules:sh.rules;
		for(var j=0;j<rules.length;j++){
		    var curRule=rules[j];
		    
		    if(curRule.style.backgroundImage){
			var bg = curRule.style.backgroundImage;
			if (bg.indexOf(dotted) != -1) {
			    bg=bg.replace(regexp,'$1$2');
			    curRule.style.backgroundImage = bg;
			}
		    }
		}
	    }
	}
	
	//Go through images
	var imgs = document.getElementsByTagName('img');
	for(var i=0;i<imgs.length;i++) {
	    if(imgs[i].src.indexOf(dotted) != -1) {
		imgs[i].src = imgs[i].src.replace(regexp,'$1$2');
	    }
	}
    }
});