var szs = new Array( '11','13','15','17','22','30' );
var slh = new Array( '1.3','1.4','1.5','1.5','1.5','1.6' );
var startSz = 0;

function ts( inc ) {
	if (!document.getElementById) return
	var sz = startSz,i,j,cTags;

	sz += inc;
	if ( sz < 0 ) sz = 0;
	if ( sz > 5 ) sz = 5;
	startSz = sz;

	document.getElementById('contenttekst').style.fontSize = szs[ sz ];
	document.getElementById('contenttekst').style.lineHeight = slh[ sz ];
}