var setInterval

function startTab(a){
	for(i=1;i<=3;i++){
		if(i==a){
			document.getElementById('tabboxContent_'+i).style.display="block";
			document.getElementById('tabboxHeader_'+i).className="tabOn";
		}
		else{
			document.getElementById('tabboxContent_'+i).style.display="none";
			document.getElementById('tabboxHeader_'+i).className="tabOff";
		}
	}
	setInterval = setTimeout("ch_tab2('2')",7000);
}

function ch_tab1(a){
	for(i=1;i<=3;i++){
		if(i==a){
			document.getElementById('tabboxContent_'+i).style.display="block";
			document.getElementById('tabboxHeader_'+i).className="tabOn";
		}
		else{
			document.getElementById('tabboxContent_'+i).style.display="none";
			document.getElementById('tabboxHeader_'+i).className="tabOff";
		}
	}
	setInterval = setTimeout("ch_tab2('2')",7000);
}

function ch_tab2(a){
	for(i=1;i<=3;i++){
		if(i==a){
			document.getElementById('tabboxContent_'+i).style.display="block";
			document.getElementById('tabboxHeader_'+i).className="tabOn";
		}
		else{
			document.getElementById('tabboxContent_'+i).style.display="none";
			document.getElementById('tabboxHeader_'+i).className="tabOff";
		}
	}
	setInterval = setTimeout("ch_tab3('3')",7000);
}

function ch_tab3(a){
	for(i=1;i<=3;i++){
		if(i==a){
			document.getElementById('tabboxContent_'+i).style.display="block";
			document.getElementById('tabboxHeader_'+i).className="tabOn";
		}
		else{
			document.getElementById('tabboxContent_'+i).style.display="none";
			document.getElementById('tabboxHeader_'+i).className="tabOff";
		}
	}
	setInterval = setTimeout("ch_tab1('1')",7000);
}

function ch_tab(a){
	clearTimeout(setInterval);
	for(i=1;i<=3;i++){
		if(i==a){
			document.getElementById('tabboxContent_'+i).style.display="block";
			document.getElementById('tabboxHeader_'+i).className="tabOn";
		}
		else{
			document.getElementById('tabboxContent_'+i).style.display="none";
			document.getElementById('tabboxHeader_'+i).className="tabOff";
		}
	}
	if(a>2)
		a=1;
	else
		a++;
	ss="ch_tab"+a;
	setInterval = setTimeout(""+ss+"('"+a+"')",70000);
}