//Specify affected tags. Add or remove from list:
var tgs = new Array( 'div','td','tr');

//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 ];
    }
}

function manipulaArvore(obj, objDiv, cssAbre, cssFecha){


        $(obj).unbind();

        $(obj).toggle(
          function()
          	{
                $('#'+objDiv).slideDown('slow');
        		$(obj).removeClass(cssAbre);
          		$(obj).addClass(cssFecha);
          	},
          function ()
          	{
          		$('#'+objDiv).slideUp('slow');
          		$(obj).removeClass(cssFecha);
          		$(obj).addClass(cssAbre);
          	}
        );
       return false;
    }