window.addEvent('domready', function(e){
	Browser.Engine.trident = function(){
		return (!window.ActiveXObject) ? false : ((window.XMLHttpRequest) ? ((Browser.Features.query) ? 6 : 5) : 4);
	}
	function x_center_el(el){
		var new_left = (window.getSize().x)/2 - (el.getSize().x)/2;
		el.setStyle('left', new_left.round() + 'px');
	}
	if(Browser.Engine.trident() && Browser.Engine.trident() < 6){
		x_center_el($('main_container'));
		x_center_el($('footer'));
		window.addEvent('resize', function(ev){
			x_center_el($('main_container'));
			x_center_el($('footer'));
		});
	}
	
	var col1 = $('main_container').getElement('div.col1');
	if(col1){
		var nav_els = col1.getElements('div.nav img');
		var suffix = '.jpg';
		var over_string = '_OVER' + suffix;
		nav_els.each(function(el){
			el.addEvent('mouseenter', function(ev){
				var src= el.get('src');
				if(src.indexOf('_OVER') == -1){
					var new_src = src.substring(0, src.length - suffix.length) + over_string;
					el.set('src', new_src);
				}else{
					el.addClass('active');
				}
			});
			el.addEvent('mouseleave', function(ev){
				var src= el.get('src');
				if(!el.hasClass('active')){
					var new_src = src.substring(0, src.length - over_string.length) + suffix;
					el.set('src', new_src);
				}
			});
		});
	}
});