browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

ns3up = (browserName == "Netscape" && browserVer >= 3);
ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

var aMOversHL = new Array("MOverPaintingsHL.gif","MOverMediaHL.gif","MOverPhotoHL.gif","MOverDesignHL.gif","MOverWebHL.gif","MOverDrawingsHL.gif","MOverBioHL.gif","MOverContactHL.gif","MOverHomeHL.gif");
var aMOvers = new Array("dot_clear.gif", "dot_clear.gif","dot_clear.gif","dot_clear.gif","dot_clear.gif","dot_clear.gif","dot_clear.gif","dot_clear.gif","dot_clear.gif");

function BtnOver(nBtnID) {	
  if (ns3up || ie4up) {
    document['MOver' + nBtnID].src = aMOversHL[nBtnID];
  }
}

function BtnOut(nBtnID) {	
  if (ns3up || ie4up) {	
    document['MOver' + nBtnID].src = aMOvers[nBtnID];	
  }
}

function scrollBack() {
  if ((nIndex-nTHUMBS) >= 0) {	
    nIndex = nIndex - nTHUMBS;
			
    document.arrownext.src = "ArrowRight.gif";

    for (i=0; i<=(nTHUMBS-1); i=i+1)
    {
      if ((nIndex+i)<=nMaxThumbs) {
        document['thumb' + i].src = aThumbPics[nIndex+i];
	aPHPics[i] = aPics[nIndex + i];
	aPHDescs[i] = aDescs[nIndex + i];
      }
    }
	
    if (nIndex==0)
      document.arrowback.src = "ArrowLeftBlank.gif";	
  }
}

function scrollNext() {
  if ((nIndex+nTHUMBS) < nMaxThumbs) {	
    nIndex = nIndex + nTHUMBS;

    document.arrowback.src = "ArrowLeft.gif";

    for (i=1; i<=(nTHUMBS-1); i=i+1)
    {
        document['thumb' + i].src = "ArrowRightBlank.gif";      
    }

    if ((nIndex+nTHUMBS)>=nMaxThumbs)
      document.arrownext.src = "ArrowRightBlank.gif";

    for (i=0; i<=(nTHUMBS-1); i=i+1)
    {
      if ((nIndex+i)<nMaxThumbs) {
        document['thumb' + i].src = aThumbPics[nIndex+i];
	aPHPics[i] = aPics[nIndex + i];
	aPHDescs[i] = aDescs[nIndex + i];
      }
    }
  }
}