Grunticon loader AMD module

grunticonLoader.js

define(function(){
	
	function grunticon( css, foo ){
		// expects a css array with 3 items representing CSS paths to datasvg, datapng, urlpng
		if( !css || css.length !== 3 ){
			return;
		}

		// Thanks Modernizr & Erik Dahlstrom
		var w = window,
			svg = !!w.document.createElementNS && !!w.document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect && !!document.implementation.hasFeature("http://www.w3.org/TR/SVG11/feature#Image", "1.1") && !(window.opera && navigator.userAgent.indexOf('Chrome') === -1),

			loadCSS = function( data ){
				var link = w.document.createElement( "link" ),
					ref = w.document.getElementsByTagName( "script" )[ 0 ];
				link.rel = "stylesheet";
				link.href = css[ data && svg ? 0 : data ? 1 : 2 ];
				ref.parentNode.insertBefore( link, ref );
			},

			// Thanks Modernizr
			img = new w.Image();

			img.onerror = function(){
				loadCSS( false );
			};

			img.onload = function(){
				loadCSS( img.width === 1 && img.height === 1 );
			};

			img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
	};	

	return grunticon;
})