var tgs = new Array();

var szs = new Array( '10pt','14pt','16pt','18pt','20pt' );

var startSz = 0;



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 ];

        }

        }