var tgs = new Array( 'div', 'p', 'li');
var szs = new Array( 'xx-small','small');
var startSz = 0;

function ts(trgt, inc)
   {
   if (!document.getElementById) return;
   var d = document, cEl = null, sz = startSz, i, j, cTags;
   sz += inc;
   if (sz < 0) sz = 0;
   if (sz > 2) sz = 1;
   startSz = sz;
   if (!(cEl = d.getElementById(trgt))) cEl = d.getElementsByTagName(trgt)[0];
   cEl.style.fontSize = szs[sz];
   for ( i = 0 ; i < tgs.length ; i++ )
      {
      cTags = cEl.getElementsByTagName(tgs[i]);
      for ( j = 0 ; j < cTags.length ; j++ ) cTags[j].style.fontSize = szs[sz];
      }
   }