var CSSColumns = 
{
   	maxHeight: 0,
    els: new Array(),
		
    equalise: function()
	{
        for( var i = 0; i < arguments.length; i++ )
		{
			if( !$(arguments[i]) )
			{	
				return;
			}
			else
			{
				this.els.push( $(arguments[i]) );
			}
		}

        this.maxHeight = this.calcMaxHeight();

        for( var i = 0; i < this.els.length; i++ )
		{
            this.els[i].style.height = this.maxHeight + "px";
        }
    },   

    calcMaxHeight: function()
	{
        var h = 0;
		
        for( var i = 0; i < this.els.length; i++ )
        {
            if( this.els[i].getHeight() > h )
            {
                h = this.els[i].getHeight();
            }
        }
		
        return h;
    }
}

 Event.observe( window, 'load', function() {CSSColumns.equalise( 'content_wrapper', 'navigation_wrapper' );} );