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

//Specify spectrum of different font sizes:
var szs = new Array( '90%','100%','110%','120%','130%' );
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 ];
			//cTags[ j ].style.fontSize = eval(12*1.5)+"px";
			//alert(cTags[ j ].style.fontSize);
		}
	}*/
}