function showTab(n){
	for(var i=1;i<=4;i++){
		if(i==n){
		    if(i==1)
		     document.getElementById("pll"+n).className="active1";
		    else
			 document.getElementById("pll"+n).className="active";
			document.getElementById("con"+n).className="show";
		}
		else{
		    if(i==1)
		     document.getElementById("pll"+i).className="unactive1";
		    else					
			 document.getElementById("pll"+i).className="unactive";
			document.getElementById("con"+i).className="hidden";
		}
	}
	
	
}