function PresList(form)
{
//  set up variables
  var speed = "";
  var cat = optVal(form.category);

  for ( var i = 0; i < 3; i++ )
  {
    if ( form.speed[i].checked )
	{
	  speed = form.speed[i].value;
	} 
  }
//  Evaluate submitted values of line speed and general category 
//  to determine the presentation list page
  
  switch (speed)
  {
    case "56k" :
      switch (cat)
      {
        case "speakers" :
          destination = 'index4Spkr_56karchive.htm'
          break;
          
        case "images" :
          destination = 'index4Img_56karchive.htm'
          break;
          
        case "paths" :
          destination = 'index4Path_56karchive.htm'
          break;
		  
		case "promo" :
          destination = 'index4promo_isdn.htm'
          break;   
		  
		case "academic" :
          destination = 'index4academic_isdn.htm'
          break; 	  
		  
		default :
		  return true;
      }
      break;
      
    case "isdn" :
      switch (cat)
      {
        case "speakers" :
          destination = 'index4Spkr_isdnarchive.htm'
          break;
          
        case "images" :
          destination = 'index4Img_isdnarchive.htm'
          break;
          
        case "paths" :
          destination = 'index4Path_isdnarchive.htm'
          break;
		  
		case "promo" :
          destination = 'index4promo_isdn.htm'
          break;   
		  
		case "academic" :
          destination = 'index4academic_isdn.htm'
          break; 
		  
		default :
		  return true;
      }
      break;
      
    case "t1" :
      switch (cat)
      {
        case "speakers" :
          destination = 'index4Spkr_LANarchive.htm'
          break;
          
        case "images" :
          destination = 'index4Img_LANarchive.htm'
          break;
          
        case "paths" :
          destination = 'index4Path_LANarchive.htm'
          break;
		  
		case "promo" :
          destination = 'index4promo_isdn.htm'
          break;   
		  
		case "academic" :
          destination = 'index4academic_isdn.htm'
          break; 
		  
		default :
		  return true;
      }
      break;
  }

//  Load up the next html page containing the presentation listing

  window.location.href=destination

  return true; 
}

// This function will pick out the value of the selected item
// of any selection list passed to it and return the value to the
// calling function
function optVal(optList)
{
  var i = optList.selectedIndex;
  var stext = optList.options[i].value;
  
  return stext;
}

function loadPres(form)
{
//  Check to see if a presentation style has been selected
//  If so, then obtain the video URL and show the video

  if ( form.PresStyle.selectedIndex > 1 )
  {
    i = form.PresStyle.selectedIndex;
    videoDest = form.PresStyle[i].value;
	
	window.location.href=videoDest;
  }
  return true;
}