var isDHTML  = 0;
var isID     = 0;
var isAll    = 0;
var isLayers = 0;

if (document.getElementById) {
 isID = 1;
 isDHTML = 1;
}
else if (document.all) {
 isAll = 1;
 isDHTML = 1;
}
else {
 browserVersion = parseInt(navigator.appVersion);
 if ((navigator.appName.indexOf('Netscape') != 1) && (browserVersion == 4)) {
  isLayers = 1;
  isDHTML = 1;
 }
}
function findDOM(objectID,withStyle) {
 if (withStyle == 1) {
  if (isID) {
   return (document.getElementById(objectID).style);
  }
  else {
   if (isAll) {
    return (document.all[objectID].style);
   }
   else {
    if (isLayers) {
	 return (document.layers[objectID]);
	}
   }
  }
 }
 else {
  if (isID) {
   return (document.getElementById(objectID));
  }
  else {
   if (isAll) {
    return (document.all[objectID]);
   }
   else {
    if (isLayers) {
	 return (document.layers[objectID]);
	}
   }
  }
 }
}

function changeNum(a) {
 for (i=0;i<=14;i++) {
  findDOM('num_'+i,0).className='off';
  findDOM('ohs_'+i,1).display='none';
 }
 findDOM('ohs_'+a,1).display='block';
 findDOM('num_'+a,0).className='on';
 findDOM('num_'+a,1).cursor='hand';
}

function useLink(obj) {
 findDOM(obj.id).click();
}