var tgs = new Array( 'div','td');
var szs = new Array( '12px','14px','16px','18px');
var startSz = 2;
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 > 3 ) sz = 3;
        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 ];
        }
}