function changeTab(prefix,divNum,count,className)
	{
		document.getElementById(prefix+"btn"+1).className = className+1;
		document.getElementById(prefix+1).style.display='none';
		for(var i=2;i<=count;i++)
		{
			document.getElementById(prefix+"btn"+i).className = className+2;
			document.getElementById(prefix+i).style.display='none';
		}
		if(divNum==1)
		{
			document.getElementById(prefix+"btn"+1).className = className+"1b";
		}
		else
		{
			document.getElementById(prefix+"btn"+divNum).className = className+"2b";
		}
		document.getElementById(prefix+divNum).style.display='block';
		
	}