function setActiveStyleSheet( title ){
	var i, a, main;
	for( i = 0 ; ( a = document.getElementsByTagName( "link" )[ i ] ); i++ ){
		if( a.getAttribute( "rel" ).indexOf( "style" ) != -1 && a.getAttribute( "title" ) ){
			a.disabled = true;
			if( a.getAttribute("title") == title ){
				a.disabled = false;
				createCookie( "style", title, 365 );
			}
		}
	}
}

function getActiveStyleSheet(){
	var i, a;
	for( i = 0 ; ( a = document.getElementsByTagName( "link" )[ i ] ); i++ ){
		if( a.getAttribute( "rel" ).indexOf( "style" ) != -1 && a.getAttribute( "title" ) && !a.disabled ){
			return a.getAttribute( "title" );
		}
	}
	return null;
}

function getPreferredStyleSheet(){
	var i, a;
	for( i = 0 ; ( a = document.getElementsByTagName( "link" )[ i ] ); i++ ){
		if( a.getAttribute( "rel" ).indexOf( "style" ) != -1 
		 && a.getAttribute( "rel" ).indexOf( "alt" ) == -1 
		 && a.getAttribute( "title" )
		){
			return a.getAttribute( "title" );
		}
	}
	return null;
}

function createCookie( name, value, days ){
	if( days ){
		var date = new Date();
		date.setTime( date.getTime() + ( days * 24 * 60 * 60 * 1000 ) );
		var expires = "; expires="+date.toGMTString();
	}else{
		expires = "";
	}
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie( name ){
	var nameEQ = name + "=";
	var ca = document.cookie.split( ';' );
	for( var i = 0 ;i < ca.length ; i++ ){
		var c = ca[ i ];
		while ( c.charAt( 0 ) == ' ' ){
			c = c.substring( 1, c.length );
		}
		if( c.indexOf( nameEQ ) == 0 ){
			return c.substring( nameEQ.length, c.length );
		}
	}
	return null;
}

window.onload = function( e ){
	var cookie = readCookie( "style" );
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet( title );
}

window.onunload = function( e ){
	var title = getActiveStyleSheet();
	createCookie( "style", title, 365 );
}

var cookie = readCookie( "style" );
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet( title );