//Specify affected tags. Add or remove from list:

var tgs = new Array( 'p','a', 'li');



//Specify spectrum of different font sizes:

var szs = new Array( 'xx-small','x-small','small','medium','large','x-large','xx-large' );

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 > 6 ) sz = 6;

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 ];

}

}