// Especifica as TAGS que podem ser alteradas
var tgs = new Array( 'div','tr','td');

// Define incremento da fonte
var szs = new Array( '9','10','11','12','13','14','15','16','18' );
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 > 9 ) sz = 9;
	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 ];
	}
}
// Como usar:
// <a href="javascript:ts('noticiaSizer',1)">+ Fonte</a>
// <a href="javascript:ts('noticiaSizer',-1)">- Fonte</a>
// adicionar na TAG : id="noticiaSizer"