function swapTab(id) {
	var max = 20;
	
	for(i=0;i<=max;i++) {
		if(document.getElementById('tabs_'+i)) {
			document.getElementById('tabs_'+i).style.display = 'none';
		}
		if(document.getElementById('tabslink_'+i)) {
			if(i==0) {
				document.getElementById('tabslink_'+i).className = 'first';
			}
			else {
				document.getElementById('tabslink_'+i).className = '';
			}
		}
	}
	document.getElementById('tabs_'+id).style.display = 'block';

	if(id==0) {
		document.getElementById('tabslink_'+id).className = 'first current';		
	}
	else {
		document.getElementById('tabslink_'+id).className = 'current';
	}
	
	if(id == 20)
	{
		document.getElementById('postprice').innerHTML = deliverylist[document.getElementById('postprices').value];
		document.getElementById('maxcost').innerHTML = maxcostlist[document.getElementById('postprices').value];
	}
	
	return false;
}