var i = 0;
					
					function next(){
						
						switch(i)
						{
							
							case 0:
							i = 1;
							break;
							
							case 1:
							i = 2;
							break;
							
							case 2:
							i = 3;
							break;
							
							case 3:
							i = 4;
							break;
							
							case 4:
							i = 5;
							break;
							
							case 5:
							i = 6;
							break;
							
							case 6:
							i = 7;
							break;
							
							case 7:
							i = 0;
							break;
							
							
						}
						
					}