//Specify affected tags. Add or remove from list:
	var tgs = new Array( 'div','td','tr','p','span','h3','li','h2');

	//Specify spectrum of different font sizes:
	var szs = new Array( 'xx-small','x-small','small','medium','large','x-large' );
	var startSz = 1;

	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 > 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 ];
		}
	}