// Author:Muhammad neamul Mowla Pinju && cookies by Marek Smatlak
function change(id){
 	if(id=='nav_a')
	{
	
		document.getElementById('gallery_box1').style.display="block";
    document.getElementById('gallery_box2').style.display="none";
		document.getElementById('gallery_box3').style.display="none";
		document.getElementById('gallery_box4').style.display="none";
		document.getElementById('gallery_box5').style.display="none";
		
    document.getElementById('nav_a').className ='slc_nav';		
		document.getElementById('nav_b').className ='ns_nav';
		document.getElementById('nav_c').className ='ns_nav';
		document.getElementById('nav_d').className ='ns_nav';
		document.getElementById('nav_e').className ='ns_nav';
		
	}
	if(id=='nav_b')
	{
		document.getElementById('gallery_box1').style.display="none";
    document.getElementById('gallery_box2').style.display="block";
		document.getElementById('gallery_box3').style.display="none";
		document.getElementById('gallery_box4').style.display="none";
		document.getElementById('gallery_box5').style.display="none";
		
    document.getElementById('nav_a').className ='ns_nav';		
		document.getElementById('nav_b').className ='slc_nav';
		document.getElementById('nav_c').className ='ns_nav';
		document.getElementById('nav_d').className ='ns_nav';
		document.getElementById('nav_e').className ='ns_nav';
		
	}
	
	
	if(id=='nav_c')
	{
		document.getElementById('gallery_box1').style.display="none";
		document.getElementById('gallery_box2').style.display="none";
		document.getElementById('gallery_box3').style.display="block";
		document.getElementById('gallery_box4').style.display="none";
		document.getElementById('gallery_box5').style.display="none";

    document.getElementById('nav_a').className ='ns_nav';		
		document.getElementById('nav_b').className ='ns_nav';
		document.getElementById('nav_c').className ='slc_nav';
		document.getElementById('nav_d').className ='ns_nav';
		document.getElementById('nav_e').className ='ns_nav';
		
	}
	
	if(id=='nav_d')
	{
		document.getElementById('gallery_box1').style.display="none";
		document.getElementById('gallery_box2').style.display="none";
		document.getElementById('gallery_box3').style.display="none";
		document.getElementById('gallery_box4').style.display="block";
		document.getElementById('gallery_box5').style.display="none";

    document.getElementById('nav_a').className ='ns_nav';				
		document.getElementById('nav_b').className ='ns_nav';
		document.getElementById('nav_c').className ='ns_nav';
		document.getElementById('nav_d').className ='slc_nav';
		document.getElementById('nav_e').className ='ns_nav';
		
	}
	
	if(id=='nav_e')
	{
		document.getElementById('gallery_box1').style.display="none";
		document.getElementById('gallery_box2').style.display="none";
		document.getElementById('gallery_box3').style.display="none";
		document.getElementById('gallery_box4').style.display="none";
		document.getElementById('gallery_box5').style.display="block";
		
		document.getElementById('nav_a').className ='ns_nav';
		document.getElementById('nav_b').className ='ns_nav';
		document.getElementById('nav_c').className ='ns_nav';
		document.getElementById('nav_d').className ='ns_nav';
		document.getElementById('nav_e').className ='slc_nav';
		
	}
	
	
	
return(id);
}// JavaScript Document