ÿþ//*** This code is copyright 2002-2003 by Gavin Kistner, gavin@refinery.com

//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt

//*** Reuse or modification is free provided you abide by the terms of that license.

//*** (Including the first two lines above in your source code satisfies the conditions.)



// Add a new stylesheet to the document;

// url [optional] A url to an external stylesheet to use

// idx [optional] The index in document.styleSheets to insert the new sheet before

function AddStyleSheet(url,idx){

	var css,before=null,head=document.getElementsByTagName("head")[0];



	if (document.createElement){

		if (url){

			css = document.createElement('link');

			css.rel  = 'stylesheet';

			css.href = url;

		} else css = document.createElement('style');

		css.media = 'all';

		css.type  = 'text/css';



		if (idx>=0){

			for (var i=0,ct=0,len=head.childNodes.length;i<len;i++){

				var el = head.childNodes[i];

				if (!el.tagName) continue;

				var tagName = el.tagName.toLowerCase();

				if (ct==idx){

					before = el;

					break;

				}

				if (tagName=='style' || tagName=='link' && (el.rel && el.rel.toLowerCase()=='stylesheet' || el.type && el.type.toLowerCase()=='text/css') ) ct++;

			}

		}

		head.insertBefore(css,before);



		return document.styleSheets[before?idx:document.styleSheets.length-1];

	} else return alert("I can't create a new stylesheet for you. Sorry.");

}

// e.g. var newBlankSheetAfterAllOthers = AddStyleSheet(); 

// e.g. var newBlankSheetBeforeAllOthers = AddStyleSheet(null,0);

// e.g. var externalSheetAfterOthers = AddStyleSheet('http://phrogz.net/JS/Classes/docs.css');

// e.g. var externalSheetBeforeOthers = AddStyleSheet('http://phrogz.net/JS/Classes/docs.css',0);





// Cross-browser method for inserting a new rule into an existing stylesheet.

// ss       - The stylesheet to stick the new rule in

// selector - The string value to use for the rule selector

// styles   - The string styles to use with the rule

function AddRule(ss,selector,styles){

	if (!ss) return false;

	if (ss.insertRule) return ss.insertRule(selector+' {'+styles+'}',ss.cssRules.length);

	if (ss.addRule){

		ss.addRule(selector,styles);

		return true;

	}

	return false;

}



// e.g. AddRule( document.styleSheets[0] , 'a:link' , 'color:blue; text-decoration:underline' );

// e.g. AddRule( AddStyleSheet() , 'hr' , 'display:none' );