var header_intervalID;
	var login;
	var height;
	var end;

	function display(){
			var img = document.getElementById("img");
			login = document.getElementById("login");
			if(login.clientHeight==0){
				img.src = './img/no_display_login.png';			
				height = 70;
				end = 0;
				up_height();
			}
			else{
				img.src = './img/display_login.png';
				height = 0;
				end = 70;
				plavno_down1();			
			}
	}

	function up_height(){

		clearInterval(header_intervalID);
		end = end + 10;
		login.style.height = end+'px';
		if(end < height){
			header_intervalID = setInterval('up_height()',1);
		}
		else{
			plavno_down();
		}
	}

	function down_height(){
		
		clearInterval(header_intervalID);
		end = end - 10;
		login.style.height = end+'px';
		if(end > height){
			header_intervalID = setInterval('down_height()',1);
		}
	}
	
	function plavno_down(){
		
		clearInterval(header_intervalID);
		end = end +2;
		login.style.height = end+'px';
		if(end < height+14){
			header_intervalID = setInterval('plavno_down()',20);
		}
		else{
			plavno_up();
		}
	}

	function plavno_up(){
		
		clearInterval(header_intervalID);
		end --;
		login.style.height = end+'px';
		if(end > height){
			header_intervalID = setInterval('plavno_up()',20);
		}
	}
	
		function plavno_down1(){
		
		clearInterval(header_intervalID);
		end ++;
		login.style.height = end+'px';
		if(end < height+84){
			header_intervalID = setInterval('plavno_down1()',20);
		}
		else{
			plavno_up1();
		}
	}

	function plavno_up1(){
		
		clearInterval(header_intervalID);
		end = end -2;
		login.style.height = end+'px';
		if((end > height)&&(end >70)){
			header_intervalID = setInterval('plavno_up1()',20);
		}
		else{
			down_height();
		}

	}