//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 = 1;

function resizeme( 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 > 4 ) 
		sz = 4;
	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 ];
	}
}