function showTab(tab)
{
	switch(tab)
	{
		case 1:	document.getElementById('search_box_event').style.display = 'block';
						document.getElementById('search_box_object').style.display = 'none';
						document.getElementById('tabEv').className = 'ev_no_active';
						document.getElementById('tabObj').className = 'obj_active';		
						break;
		case 2:	document.getElementById('search_box_event').style.display = 'none';
						document.getElementById('search_box_object').style.display = 'block';
						document.getElementById('tabObj').className = 'obj_no_active';
						document.getElementById('tabEv').className = 'ev_active';
						break;
	}
	
	document.getElementById('validSearchEvent').value = '';
	document.getElementById('validSearchEvent').style.display = 'none';
	document.getElementById('validSearchObject').value = '';
	document.getElementById('validSearchObject').style.display = 'none';
}