// NAVIGATION OBJECT
// provides rollover functions


function NavObject() {

  // attributes
  this.label = new Array();
  this.segments = new Array();
  this.segcount = 0;
  
  // methods  
  this.setLabelBase = setLabelBase;
  this.setLabelLang = setLabelLang;  
  this.addSegment = addSegment;  

  this.change = change;
  

}



function setLabelBase(labelElem, labelBaseFilename) {

  this.label['elem'] = document.images[labelElem];
  this.label['norm'] = new Image(); 
  this.label['norm'].src = imgDir + labelBaseFilename + '_norm.gif'; 
  this.label['high'] = new Image(); 
  this.label['high'].src = imgDir + labelBaseFilename + '_hi.gif';

}


function setLabelLang(labelElem, labelFileNorm, labelFileHigh) {

  this.label['elem'] = document.images[labelElem];
  this.label['norm'] = new Image(); 
  this.label['norm'].src = imgLangDir + labelFileNorm; 
  this.label['high'] = new Image(); 
  this.label['high'].src = imgLangDir + labelFileHigh;

}


function addSegment(segElem, segFileNorm, segFileHigh) {
  var seg = new Array();
  
  seg['elem'] = document.images[segElem];
  seg['norm'] = new Image() 
  seg['norm'].src = imgDir + segFileNorm;
  seg['high'] = new Image() 
  seg['high'].src = imgDir + segFileHigh;  
  
  //this.segments[this.segCount] = seg;
  this.segments.push(seg);  
  this.segcount++;
  //alert (this.segcount);  
}




function change(type) {
  
  //alert(this.label[type].src);
  this.label['elem'].src = this.label[type].src;
   
  //alert (this.segments.length);

  for(var i=0; i < this.segments.length; i++) {
     this.segments[i]['elem'].src = this.segments[i][type].src;
  }

}