var c_setter = new Class({
	initialize: function(element) {
	// white page
	this.contrast = 'low';
	},
	set: function(){	
		if (this.contrast == 'low') {
			$('big_container').setStyles({
				'color': '#FFFFFF'
			});
		
	  $('body_tag').setStyles({
									'background-color': '#000000',
									'background-image': 'none'
	   });
	
	  
	  var news = $$('td.title_td');
	  var titles = $$('td.data');
	  
	  news.extend(titles);
	  
	  news.each(function(element) {
			element.setStyles ({
					'background-color':'#000'		  
			})	 
	   });
	
	  
		var color_3 = '#333'
	
	    $('usability').setStyle('color', color_3);
			
		var elements = $$('td.menu_td');
			elements.each(function(element){
				element.setStyles({
					'background-image': 'none',
					'color': '#FFFFFF',
					'background-color': '#000'
				});
			});

			$('top_block').setStyle('color','#FFF');
			$('ankiety').setStyle('background-image','none');
			
			var elements_2 = $$('#usability a');
			var elements_3 = $$('#top_block a');
			var elements_4 = $$('.standardowa_nawigacja a');
			var elements_5 = $$('a');
			elements_2.extend(elements_3);
			elements_2.extend(elements_4);
			elements_2.extend(elements_5);
			elements_2.each(function(element) {
				element.setStyle('color', '#FFFFFF')
			})
					// here ends set function
			this.contrast = 'high'
			/**/
		}
		
		
		
		else {
			$('big_container').setStyles({
				'color': '#333'
			});
	   $('body_tag').setStyles({
									'background-color': '#FFFFFF',
									'background-image': 'url(img/background/body_background.jpg)',
									'color': '#333'
		});
	
			$('usability').setStyle('color', '#FFFFFF');
			
			
	  var news = $$('td.title_td');
	  var titles = $$('td.data');
	  
	  news.extend(titles);
	  
	  news.each(function(element) {
			element.setStyles ({
					'background-color':'#dddddd'		  
			})	 
	   });
			
			
			var elements = $$('td.menu_td');
			elements.each(function(element){
				element.setStyles({
					'background-image': 'url(img/background/menu_background.jpg)',
					'color': '#FFFFFF'
				});
			});
			$('top_block').setStyle('color','#333');
			$('ankiety').setStyle('background-image','url(img/background/ankiety_background.jpg)');
			
			var elements_2 = $$('#usability a');
			var elements_3 = $$('#top_block a');
			var elements_4 = $$('.standardowa_nawigacja a');
			var elements_5 = $$('a');
			elements_2.extend(elements_3);
			elements_2.extend(elements_4);
			elements_2.extend(elements_5);
			elements_2.each(function(element){
				element.setStyle('color', '#333333');
			})
					// here ends set function
			this.contrast = 'low'
		}
	}
});

var my_contrast = new c_setter();

function set_contrast() {
	my_contrast.set();
}