/*
  *     slide_mgr.js -- Map Gallery Slide Manager  Library
/* ----------------------------------------------------------------------------------------------------- */
/*
   version 1.0 -- Jim Cory, Horizon Mapping
 
*/

/*
-- Example of variable settings reqd in html head tag --

var currmapdiv = 0 ;
var maxmapdiv = 3 ;
var infodivs = new Array() ;

// assign values to array elements

infodivs[0] = "mapdiv0" ;
infodivs[1] = "mapdiv1" ;
infodivs[2] = "mapdiv2" ;
infodivs[3] = "mapdiv3" ;

*/

function toggleDiv(divid){
var ix;

// alert(divid);
// alert(infodivs[divid]) ;
// alert(document.getElementById("mapdiv0").style.display) ;
for (ix=0; ix<=maxmapdiv ; ix++)
{ 
// alert(ix) ;
  document.getElementById(infodivs[ix]).style.display = 'none';
}
if (divid < 0) { 
 currmapdiv = maxmapdiv ;
 document.getElementById(infodivs[currmapdiv]).style.display = 'block'; 
}
else if (divid > maxmapdiv)
{ currmapdiv = 0 ;
  document.getElementById(infodivs[currmapdiv]).style.display = 'block';
}
else
{ 
// alert(infodivs[divid]) ;
  document.getElementById(infodivs[divid]).style.display = 'block';
}
}

function slideControl(buttonType, mouseType) {

  switch (buttonType) {
    case 'prevchap':
	  switch (mouseType) {
	    case 'down':
          currmapdiv = 0 ; 
          document.images.prevchap.src='images/openbook_nav_prevchapoff.png' ;
          toggleDiv(currmapdiv);
		break ;
	    case 'over':
		  if (currmapdiv > 0) {
	        document.images.prevchap.src='images/openbook_nav_prevchapover.png';
		  }
		  break ;
		case 'out':
		  if (currmapdiv > 0) {
	        document.images.prevchap.src='images/openbook_nav_prevchap.png'; 
		  }
		  else {
		    document.images.prevchap.src='images/openbook_nav_prevchapoff.png' ;
		  }
		  break ;
	  }
	  break ;
	case 'prevpg':
	  switch (mouseType) {
	    case 'down':
          currmapdiv = currmapdiv - 1 ;
          if (currmapdiv == 0) {  
		    document.images.prevchap.src='images/openbook_nav_prevchapoff.png' ;
		  }
		  else {
		    document.images.prevchap.src='images/openbook_nav_prevchap.png' ; 
		  }		  
          toggleDiv(currmapdiv);
		  break ;
		case 'over':
	      document.images.prevpg.src='images/openbook_nav_prevpgover.png'; 
          break ;
		case 'out':
    	  document.images.prevpg.src='images/openbook_nav_prevpg.png' ;
		  break ;
		  }
	  break ;
	case 'nextpg':
	  switch (mouseType) {
	    case 'down':
		  currmapdiv = currmapdiv + 1 ; 
          if (currmapdiv <= maxmapdiv) {
		    document.images.prevchap.src='images/openbook_nav_prevchap.png' ; 
		  }
		  else {
		    document.images.prevchap.src='images/openbook_nav_prevchapoff.png' ; 
		  }
	      toggleDiv(currmapdiv);
		  break ;
		case 'over':
		  document.images.nextpg.src='images/openbook_nav_nextpgover.png' ;
          break ;
		case 'out':
          document.images.nextpg.src='images/openbook_nav_nextpg.png' ;
		  break ;
		  }
	  break ;
	case 'nextchap':
	  switch (mouseType) {
	    case 'down':
		  currmapdiv = maxmapdiv;
          toggleDiv(currmapdiv) ;
  		  document.images.prevchap.src='images/openbook_nav_prevchap.png' ; 
		  break ;
		case 'over':
	      document.images.nextchap.src='images/openbook_nav_nextchapover.png' ; 
          break ;
		case 'out':
    	  document.images.nextchap.src='images/openbook_nav_nextchap.png' ;
		  break ;
		  }
	  break ;

  }
	 
}
 
 function getanchor() {
  currURL = document.URL ;
//  alert(currURL) ;
  docanchor = currURL.substr(currURL.indexOf("#") + 1) ;
// alert(docanchor) ;
  currmapdiv = parseInt(docanchor,10) ;
// alert("--" + currmapdiv) ;
  if(!(isNaN(docanchor))) {
    toggleDiv(currmapdiv) ;
 }
  else {
//    alert("no go") ;
	currmapdiv = 0 ;
	  }
}