// JavaScript Document
//salve com o nome por texto:
var tgs = new Array( 'div','td','tr');

//Specify spectrum of different font sizes:
var szs = new Array( 'xx-small','x-small','small','medium');
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 > 3 ) sz = 3;
   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 ];
   }
}