//Specify spectrum of different font sizes:
var tgs = new Array( 'div','td','tr');
var szs = new Array( 'x-small','small','medium','large','x-large' );
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 ];
 }
}