/*-------------------------------------------------------------------- 
* JQuery Plugin: "EqualHeights" & "EqualWidths"
* by:	Scott Jehl, Todd Parker, Maggie Costello Wachs (http://www.filamentgroup.com)
*
* Copyright (c) 2007 Filament Group
* Licensed under GPL (http://www.opensource.org/licenses/gpl-license.php)
*
* Description: Compares the heights or widths of the top-level children of a provided element 
and sets their min-height to the tallest height (or width to widest width). Sets in em units 
by default if pxToEm() method is available.
* Dependencies: jQuery library, pxToEm method	(article: http://www.filamentgroup.com/lab/retaining_scalable_interfaces_with_pixel_to_em_conversion/)							  
* Usage Example: $(element).equalHeights();
Optional: to set min-height in px, pass a true argument: $(element).equalHeights(true);
* Version: 2.0, 07.24.2008
* Changelog:
*  08.02.2007 initial Version 1.0
*  07.24.2008 v 2.0 - added support for widths
--------------------------------------------------------------------*/

$.fn.equalHeights = function(px) {
    $(this).each(function() {
        var currentTallest = 0;
        $(this).children().each(function(i) {
            if ($(this).height() > currentTallest) { currentTallest = $(this).height(); }
        });
        if (!px || !Number.prototype.pxToEm) currentTallest = currentTallest.pxToEm(); //use ems unless px is specified
        // for ie6, set height since min-height isn't supported
        if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({ 'height': currentTallest }); }
        $(this).children().css({ 'min-height': currentTallest });
    });
    return this;
};

// just in case you need it...
$.fn.equalWidths = function(px) {
    $(this).each(function() {
        var currentWidest = 0;
        $(this).children().each(function(i) {
            if ($(this).width() > currentWidest) { currentWidest = $(this).width(); }
        });
        if (!px || !Number.prototype.pxToEm) currentWidest = currentWidest.pxToEm(); //use ems unless px is specified
        // for ie6, set width since min-width isn't supported
        if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({ 'width': currentWidest }); }
        $(this).children().css({ 'min-width': currentWidest });
    });
    return this;
};


/*-------------------------------------------------------------------- 
* javascript method: "pxToEm"
* by:
Scott Jehl (scott@filamentgroup.com) 
Maggie Wachs (maggie@filamentgroup.com)
http://www.filamentgroup.com
*
* Copyright (c) 2008 Filament Group
* Dual licensed under the MIT (filamentgroup.com/examples/mit-license.txt) and GPL (filamentgroup.com/examples/gpl-license.txt) licenses.
*
* Description: Extends the native Number and String objects with pxToEm method. pxToEm converts a pixel value to ems depending on inherited font size.  
* Article: http://www.filamentgroup.com/lab/retaining_scalable_interfaces_with_pixel_to_em_conversion/
* Demo: http://www.filamentgroup.com/examples/pxToEm/	 	
*							
* Options:  	 								
scope: string or jQuery selector for font-size scoping
reverse: Boolean, true reverses the conversion to em-px
* Dependencies: jQuery library						  
* Usage Example: myPixelValue.pxToEm(); or myPixelValue.pxToEm({'scope':'#navigation', reverse: true});
*
* Version: 2.0, 08.01.2008 
* Changelog:
*		08.02.2007 initial Version 1.0
*		08.01.2008 - fixed font-size calculation for IE
--------------------------------------------------------------------*/

Number.prototype.pxToEm = String.prototype.pxToEm = function(settings) {
    //set defaults
    settings = jQuery.extend({
        scope: 'body',
        reverse: false
    }, settings);

    var pxVal = (this == '') ? 0 : parseFloat(this);
    var scopeVal;
    var getWindowWidth = function() {
        var de = document.documentElement;
        return self.innerWidth || (de && de.clientWidth) || document.body.clientWidth;
    };

    /* When a percentage-based font-size is set on the body, IE returns that percent of the window width as the font-size. 
    For example, if the body font-size is 62.5% and the window width is 1000px, IE will return 625px as the font-size. 	
    When this happens, we calculate the correct body font-size (%) and multiply it by 16 (the standard browser font size) 
    to get an accurate em value. */

    if (settings.scope == 'body' && $.browser.msie && (parseFloat($('body').css('font-size')) / getWindowWidth()).toFixed(1) > 0.0) {
        var calcFontSize = function() {
            return (parseFloat($('body').css('font-size')) / getWindowWidth()).toFixed(3) * 16;
        };
        scopeVal = calcFontSize();
    }
    else { scopeVal = parseFloat(jQuery(settings.scope).css("font-size")); };

    var result = (settings.reverse == true) ? (pxVal * scopeVal).toFixed(2) + 'px' : (pxVal / scopeVal).toFixed(2) + 'em';
    return result;
};