//Specify affected tags. Add or remove from list:
var tgs = new Array( 'div','td','tr');

//Specify spectrum of different font sizes:
var szs = new Array( 'xx-small','x-small','small','medium','large','x-large','xx-large' );
var startSz = 2;

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 > 6 ) sz = 6;
		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 ];
	}
}