/*



	by Paul@YellowPencil.com and Scott@YellowPencil.com



	includes TextResizeDetector by Lawrence Carvalho <carvalho@uk.yahoo-inc.com>



	feel free to delete all comments except for the above credit



*/







// Replace 'center' 'right' and 'left' with the ID names of the columns you want to balance.



// The last one is there to show how you can add more columns.  Just delete the ones you're not using.



var divs = new Array('leftColumn', 'rightColumn', 'mainColumn');







// Initialize Scripts - is this a browser that understands DOM?



function scriptInit() { if (!document.getElementById) { return; } }







// Set up Event Listener



function addEvent(elm, evType, fn, useCapture) { 



	if (elm.addEventListener) { elm.addEventListener(evType, fn, useCapture); return true; } 



	else if (elm.attachEvent) { var r = elm.attachEvent('on' + evType, fn); return r; }



	else { elm['on' + evType] = fn; }



}







// Start Column Script



function setTall() {



	if (document.getElementById) { var maxHeight = 0; for (var i = 0; i < divs.length; i++) {



			if (document.getElementById(divs[i]) != null)



			{ var div = document.getElementById(divs[i]); div.style.height = null; if (div.offsetHeight > maxHeight) maxHeight = div.offsetHeight; }



		}



	for (var i = 0; i < divs.length; i++) {



			if (document.getElementById(divs[i]) != null)



			{ var div = document.getElementById(divs[i]); div.style.height = maxHeight + 'px'; if (div.offsetHeight > maxHeight) { div.style.height = (maxHeight - (div.offsetHeight - maxHeight)) + 'px'; } }



		}



	}



}







// Assign one of the columns to the TextResizeDetector.



function initTall() {



	if (document.getElementById) { for (var i = 0; i < divs.length; i++)



		{ if (document.getElementById(divs[i]) != null) { TextResizeDetector.TARGET_ELEMENT_ID = divs[i]; break; } }



	setTall(); } 



}







// Fire Events



addEvent(window, 'load', initTall, false);



addEvent(window, 'resize', setTall, false);







/*	Detects changes to font sizes when user changes browser settings



	Fires a custom event with the following data:



	iBase  : base font size



	iDelta : difference in pixels from previous setting



	iSize  : size in pixel of text



	author Lawrence Carvalho carvalho@uk.yahoo-inc.com */







// @constructor



TextResizeDetector = function() {



    var el  = null;



	var iIntervalDelay  = 200;



	var iInterval = null;



	var iCurrSize = -1;



	var iBase = -1;



 	var aListeners = [];



 	var createControlElement = function() {



	 	el = document.createElement('span');



		el.id='textResizeControl';



		el.innerHTML='&nbsp;';



		el.style.position="absolute";



		el.style.left="-9999px";



		var elC = document.getElementById(TextResizeDetector.TARGET_ELEMENT_ID);



		// insert before firstChild



		if (elC)



			elC.insertBefore(el,elC.firstChild);



		iBase = iCurrSize = TextResizeDetector.getSize();



 	};







 	function _stopDetector() {



		window.clearInterval(iInterval);



		iInterval=null;



	};



	function _startDetector() {



		if (!iInterval) {



			iInterval = window.setInterval('TextResizeDetector.detect()',iIntervalDelay);



		}



	};







 	 function _detect() {



 		var iNewSize = TextResizeDetector.getSize();







 		if(iNewSize!== iCurrSize) {



			for (var 	i=0;i <aListeners.length;i++) {



				aListnr = aListeners[i];



				var oArgs = {  iBase: iBase,iDelta:((iCurrSize!=-1) ? iNewSize - iCurrSize + 'px' : "0px"),iSize:iCurrSize = iNewSize};



				if (!aListnr.obj) {



					aListnr.fn('textSizeChanged',[oArgs]);



				}



				else  {



					aListnr.fn.apply(aListnr.obj,['textSizeChanged',[oArgs]]);



				}



			}







 		}



 		return iCurrSize;



 	};



	var onAvailable = function() {



		if (!TextResizeDetector.onAvailableCount_i ) {



			TextResizeDetector.onAvailableCount_i =0;



		}







		if (document.getElementById(TextResizeDetector.TARGET_ELEMENT_ID)) {



			TextResizeDetector.init();



			if (TextResizeDetector.USER_INIT_FUNC){



				TextResizeDetector.USER_INIT_FUNC();



			}



			TextResizeDetector.onAvailableCount_i = null;



		}



		else {



			if (TextResizeDetector.onAvailableCount_i<600) {



	  	 	    TextResizeDetector.onAvailableCount_i++;



				setTimeout(onAvailable,200)



			}



		}



	};



	setTimeout(onAvailable,500);







 	return {



		 	/*



		 	 * Initializes the detector



		 	 *



		 	 * @param {String} sId The id of the element in which to create the control element



		 	 */



		 	init: function() {







		 		createControlElement();



				_startDetector();



 			},



			/**



			 * Adds listeners to the ontextsizechange event.



			 * Returns the base font size



			 *



			 */



 			addEventListener:function(fn,obj,bScope) {



				aListeners[aListeners.length] = {



					fn: fn,



					obj: obj



				}



				return iBase;



			},



			/**



			 * performs the detection and fires textSizeChanged event



			 * @return the current font size



			 * @type {integer}



			 */



 			detect:function() {



 				return _detect();



 			},



 			/**



 			 * Returns the height of the control element



 			 *



			 * @return the current height of control element



			 * @type {integer}



 			 */



 			getSize:function() {



	 				var iSize;



			 		return el.offsetHeight;











 			},



 			/**



 			 * Stops the detector



 			 */



 			stopDetector:function() {



				return _stopDetector();



			},



			/*



			 * Starts the detector



			 */



 			startDetector:function() {



				return _startDetector();



			}



 	}



 }();







/*** end TextResizeDetector */







TextResizeDetector.TARGET_ELEMENT_ID = 'doc';



TextResizeDetector.USER_INIT_FUNC = function() {



	var iBase = TextResizeDetector.addEventListener(setTall, null);



};