Get max width/height of a collection of objects.

jquery.maxDimension.js

jQuery.fn.maxDimension = function( property ) {
	var max = 0;

	jQuery( this ).each( function() {
		var value = jQuery( this )[ property ]();
		if ( value > max ) {
			max = value;
		}
	});

	return max;
};

jQuery.fn.maxHeight = function() {
	return jQuery( this ).maxDimension( 'height' );
};

jQuery.fn.maxWidth = function() {
	return jQuery( this ).maxDimension( 'width' );
};