function nav(tab){

	bigtab(tab);/*

	switch(tab){

		case 1:

		bigtab(1);

			

		break;

		case 2: bigtab(2);

		

		}*/

	}

function nav(tab){

	document.getElementById('nav-l1').style.backgroundImage='url(style/images/nav-l1-t'+tab+'.png)';

	for(i=1;i<=3;i++)

		if(i!=tab)

			document.getElementById('nav-l2-t'+i).style.display='none';

	document.getElementById('nav-l2-t'+tab).style.display='inline';

	}