var currentPanel;
   function showPanel(panelNum) {
      //hide visible panel, show selected panel, 
      //set tab
      if (currentPanel != null) {
         hidePanel();
      }
      document.getElementById 
         ('panel'+panelNum).style.display = 'block';
         currentPanel = panelNum;
         setState(panelNum);
   }
   function hidePanel() {
      //hide visible panel, unhilite tab
	  if ((currentPanel)=='4'){
	  document.getElementById('panel'+currentPanel).style.display = 'none';
      document.getElementById('tab'+currentPanel).style.backgroundColor = '#ffffcc';
      document.getElementById('tab'+currentPanel).style.borderBottomWidth = '1px';  
      document.getElementById('tab'+currentPanel).style.borderBottomColor = '#ababab';

	  }
	  else{
	  
	  
	  
      document.getElementById('panel'+currentPanel).style.display = 'none';
      document.getElementById('tab'+currentPanel).style.backgroundColor = '#dddddd';
      document.getElementById('tab'+currentPanel).style.borderBottomWidth = '1px';  
      document.getElementById('tab'+currentPanel).style.borderBottomColor = '#ababab';}

   }
   function setState(tabNum) {
      if (tabNum==currentPanel) {
         document.getElementById('tab'+tabNum).style.backgroundColor = '#FFFFFF';
		 document.getElementById('tab'+tabNum).style.borderBottomWidth = '2px';  
		 document.getElementById('tab'+tabNum).style.borderBottomColor = 'White';  
      }
	  else if (tabNum == '4'){
      document.getElementById('tab'+tabNum).style.backgroundColor = '#ffffcc';
      document.getElementById('tab'+tabNum).style.borderBottomWidth = '1px';  
      document.getElementById('tab'+tabNum).style.borderBottomColor = '#ababab';

	  }
		  
      else if (tabNum != '4'){
         document.getElementById
           ('tab'+tabNum).style.backgroundColor = 
           '#dddddd';
		   				 document.getElementById('tab'+tabNum).style.borderBottomWidth = '1px';  
		 document.getElementById('tab'+tabNum).style.borderBottomColor = '#ababab';  

      }
   }
   function hover(tab) {
      tab.style.backgroundColor = '#ffffff';
		tab.style.cursor = 'hand';
  }