function hideAll(tab,row,tab_num,img_dir) {
				document.getElementById('project_01').style.display = 'none';
				document.getElementById('li_tab_01').className = 'tab_unselected';

				document.getElementById('project_02').style.display = 'none';
				document.getElementById('li_tab_02').className = 'tab_unselected';

				document.getElementById('project_03').style.display = 'none';
				document.getElementById('li_tab_03').className = 'tab_unselected';

				document.getElementById('project_04').style.display = 'none';
				document.getElementById('li_tab_04').className = 'tab_unselected';

				document.getElementById('project_05').style.display = 'none';
				document.getElementById('li_tab_05').className = 'tab_unselected';

				document.getElementById('project_06').style.display = 'none';
				document.getElementById('li_tab_06').className = 'tab_unselected';

				document.getElementById('project_07').style.display = 'none';
				document.getElementById('li_tab_07').className = 'tab_unselected';

				document.getElementById('project_08').style.display = 'none';
				document.getElementById('li_tab_08').className = 'tab_unselected';

				document.getElementById('project_09').style.display = 'none';
				document.getElementById('li_tab_09').className = 'tab_unselected';

				document.getElementById('project_10').style.display = 'none';
				document.getElementById('li_tab_10').className = 'tab_unselected';

				document.getElementById('project_11').style.display = 'none';
				document.getElementById('li_tab_11').className = 'tab_unselected';

				document.getElementById('project_12').style.display = 'none';
				document.getElementById('li_tab_12').className = 'tab_unselected';



				document.getElementById(tab).className = 'tab_selected';
				document.getElementById(row).style.display = '';

			
			}