function changeTab(iTab, iDiv, aTab, aDiv) {
	
	iTab=document.getElementById(iTab);
	iDiv=document.getElementById(iDiv);
	iTab.className='inactive';
	iDiv.className='hidden';

	aTab=document.getElementById(aTab);
	aDiv=document.getElementById(aDiv);
	aTab.className='current';
	aDiv.className='';
}
function changeTabs(aTab, aDiv, iTab, iDiv, i2Tab, i2Div) {
	
	iTab=document.getElementById(iTab);
	iDiv=document.getElementById(iDiv);
	iTab.className='';
	iDiv.className='hidden';

	i2Tab=document.getElementById(i2Tab);
	i2Div=document.getElementById(i2Div);
	i2Tab.className='';
	i2Div.className='hidden';
	
	aTab=document.getElementById(aTab);
	aDiv=document.getElementById(aDiv);
	aTab.className='current';
	aDiv.className='';
}
function change4Tabs(aTab, aDiv, iTab, iDiv, i2Tab, i2Div, i3Tab, i3Div) {
	
	iTab=document.getElementById(iTab);
	iDiv=document.getElementById(iDiv);
	iTab.className='';
	iDiv.className='hidden';

	i2Tab=document.getElementById(i2Tab);
	i2Div=document.getElementById(i2Div);
	i2Tab.className='';
	i2Div.className='hidden';
	
	i3Tab=document.getElementById(i3Tab);
	i3Div=document.getElementById(i3Div);
	i3Tab.className='';
	i3Div.className='hidden';
	
	aTab=document.getElementById(aTab);
	aDiv=document.getElementById(aDiv);
	aTab.className='current';
	aDiv.className='';
}