var tgs = new Array();
var szs = new Array( '9.6pt','12pt','14pt','16pt','18pt' );
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 ];
        }
        }