/**
 * @author bormann
 */

$(document).ready(function(){
	
	// handle browser background image
	
	var initialHeihgt    = $(window).height();	
	var initialPositionY = -(970-initialHeihgt);	
	
	$('body').css({'background-position' : 'center ' + initialPositionY + 'px'});	
	
		
	$(window).resize(function() {				
		var currentHeihgt    = $(window).height();	
		var currentPositionY = -(970-currentHeihgt);			

		$('body').css({'background-position' : 'center ' + currentPositionY + 'px'});
		
	});
	
	// image gallery
	
	$('#gallery_small li').click(function(){		
		var imgNum = $(this).attr('id');		
		openGalleryBig(imgNum);
	});
	
	$('#close').click(function(){
		$('#gallery_big_wrapper').hide();
		$('#gallery_small').show();
	});
	
	$('.pager').click(function(){
		var direction = $(this).attr('id');
		pageGalleryBig(direction);
	});
	
	function openGalleryBig (imgNum){
		
		switch(imgNum) {
			
			case "img01":
				$('#gallery_big ul').css({'left' : '0px'});	
				$('#count span').html("1");	
				$('#paging>a').attr('href', 'downloads/Finger_vom_Handy.pdf');					
				$('#gallery_big_wrapper').show();
				$('#gallery_small').hide();						
				break;
							
			case "img02":			
				$('#gallery_big ul').css({'left' : '-617px'});
				$('#count span').html("2");
				$('#paging>a').attr('href', 'downloads/Fahr_nicht_so_schnell.pdf');		
				$('#gallery_big_wrapper').show();
				$('#gallery_small').hide();					
				break;
			
			case "img03":			
				$('#gallery_big ul').css({'left' : '-1234px'});		
				$('#count span').html("3");
				$('#paging>a').attr('href', 'downloads/Lass_Dir_Zeit.pdf');
				$('#gallery_big_wrapper').show();
				$('#gallery_small').hide();
				break;
			case "img04":			
				$('#gallery_big ul').css({'left' : '-1851px'});		
				$('#count span').html("4");
				$('#paging>a').attr('href', 'downloads/LKW.pdf');
				$('#gallery_big_wrapper').show();
				$('#gallery_small').hide();
				break;	
		}			
	}
	
	function pageGalleryBig(direction){
		
		var position  = $("#gallery_big ul").position();			
		var currentImagePosition = position.left;
		
		var count = $("#count span").html();
		var currentNumber = Number(count);
		
		switch(direction) {
			
			case "prev":		
				if(currentImagePosition < 0){				
					$('#gallery_big ul').css({'left' : currentImagePosition + 617});
					$("#count span").html(currentNumber - 1);
					currentImagePosition = currentImagePosition + 617;					
					currentNumber = currentNumber - 1;
					if (currentNumber == 3){
						$('#paging>a').attr('href', 'downloads/Fahr_nicht_so_schnell.pdf');
					}
					else if(currentNumber == 2){
						$('#paging>a').attr('href', 'downloads/Finger_vom_Handy.pdf');	
					}
					else if(currentNumber == 1){
						$('#paging>a').attr('href', 'downloads/Lass_Dir_Zeit.pdf');
					}
					else {
						$('#paging>a').attr('href', 'downloads/LKW.pdf');
					}
				}				
				break;
							
			case "next":
				if(currentImagePosition > -1851){
					$('#gallery_big ul').css({'left' : currentImagePosition - 617});
					$("#count span").html(currentNumber + 1);
					currentImagePosition = currentImagePosition - 617;					
					currentNumber = currentNumber + 1;
					if (currentNumber == 3){
						$('#paging>a').attr('href', 'downloads/Fahr_nicht_so_schnell.pdf');
					}
					else if(currentNumber == 2){
						$('#paging>a').attr('href', 'downloads/Finger_vom_Handy.pdf');	
					}
					else if(currentNumber == 1){
						$('#paging>a').attr('href', 'downloads/Lass_Dir_Zeit.pdf');
					}
					else {
						$('#paging>a').attr('href', 'downloads/LKW.pdf');
					}
				}				
				break;
		}		
	}
	
});