// JavaScript Document
var score=0;
function switch_tab(){
                                if(score==6){
									score=1;
								}else{
									score=score+1;
								}
                                switch(score){								
								case 0:
								    break
								case 1:
								    document.getElementById("z1").style.display="";
									document.getElementById("z2").style.display="none";
									document.getElementById("z3").style.display="none";
									document.getElementById("z4").style.display="none";
									document.getElementById("z5").style.display="none";					
									break
								case 2:
								    document.getElementById("z1").style.display="none";
									document.getElementById("z2").style.display="";
									document.getElementById("z3").style.display="none";
									document.getElementById("z4").style.display="none";
									document.getElementById("z5").style.display="none";																	
									break
								case 3:
								    document.getElementById("z1").style.display="none";
									document.getElementById("z2").style.display="none";
									document.getElementById("z3").style.display="";
									document.getElementById("z4").style.display="none";
									document.getElementById("z5").style.display="none";																		
									break
								case 4:
								    document.getElementById("z1").style.display="none";
									document.getElementById("z2").style.display="none";
									document.getElementById("z3").style.display="none";
									document.getElementById("z4").style.display="";
									document.getElementById("z5").style.display="none";																	
									break
								case 5:
								    document.getElementById("z1").style.display="none";
									document.getElementById("z2").style.display="none";
									document.getElementById("z3").style.display="none";
									document.getElementById("z4").style.display="none";
									document.getElementById("z5").style.display="";																	
									break}								
								setTimeout("switch_tab();",2000);
							}
							setTimeout('switch_tab()',1);