///////////////////////////
// GLOBAL VARIABLES
///////////////////////////

// dynamic data from DB via PHP
var slide_filenames = new Array( '_modules/showImg.php?id=538', '_modules/showImg.php?id=541', '_modules/showImg.php?id=542', '_modules/showImg.php?id=539',  null ); 
var slide_titles = new Array( '"INIDA" veikla', 'Magnum kompiuteriai', 'IT priežiūros paslaugos', 'AKCIJOS',  null ); 
var slide_timers = new Array( 4, 4, 4, 5,  null ); 
var slide_newrows = new Array( 1, 0, 0, 0,  null ); 
var slide_urls = new Array( '?p=8', '?p=9', 'http://www.itmaster.lt', '?p=10',  null ); 

slide_count = slide_filenames.length - 1; // quickhack: skip last null

i = -1;
i_timeout_id = null;

///////////////////////////
// code
///////////////////////////
   
// preload images
var slide_images = new Array();
for (i=0; i<slide_count; i++)
{
  slide_images[i]     = new Image();
  slide_images[i].src = slide_filenames[i];
}

///////////////////////////
// FUNCTIONS
///////////////////////////

// swap background image
function doSlideShow(action)
{
   i = ( i < slide_count-1 )  // -1 because index starts from 0 not 1
      ? i+1 
      : 0;
   
   redrawSlideMenu(i, action);   
   
}

function slideMenu(slide_requested)
{
   var menu = "";
   for(var i=0;i<slide_count;i++)
   {
      var extraclass = (slide_requested == i ) ? ' slide_menu_active' : '';
      var newrow = slide_newrows[i];
      if (newrow) menu += "<br>";
      menu += "<a";
      menu += " class='slide_menu"+extraclass+"'";
      menu += " onmouseover='redrawSlideMenu("+i+", \"pause\")'";
      menu += " onmouseout='redrawSlideMenu("+i+", \"resume\")'";
      menu += " onmouseclick='window.href=\""+slide_urls[i]+"\"'";
      menu += " href='"+slide_urls[i]+"'";
      menu += ">"+slide_titles[i]+"</a> ";
   }
   
   return "<div class='extrapadding'>"+menu+"</div>";
}

function redrawSlideMenu(slide_requested, action )
{
   
   // stop/start timer on hover
   if (action == 'pause')
   {
      clearTimeout(i_timeout_id);
      i_timeout_id = null;
   }
   else
   {
      if (i_timeout_id != null) clearTimeout(i_timeout_id);
      i_timeout_id = setTimeout("doSlideShow('timer')", slide_timers[slide_requested] * 1000);
   }
   
   if ( i != slide_requested || action == 'first' || action == 'timer') 
   {
      // set current slide index (i) to slide requested
      i = slide_requested;
      var slide = document.getElementById('slideshow');
      var bg = "url(" + slide_images[i].src + ")";
      if ((slide.style.backgroundImage) != bg ) { slide.style.backgroundImage = bg;};
      slide.innerHTML = slideMenu(i).replace(/&quot;/g, '"').replace(/&apos;/g, "'");
      slide.onclick = function(){window.location = slide_urls[i];};
      slide.onmouseover = function(){redrawSlideMenu(i, 'pause');};
      slide.onmouseout = function(){redrawSlideMenu(i, 'resume');};
   
   }
}