//Specify affected tags. Add or remove from list:
//var tgs = new Array( 'div', 'a', 'span' );
var tgs = new Array( 'div', 'span');
var tgs1 = new Array( 'a');

//Specify spectrum of different font sizes:
var szs = new Array('8pt' ,'9pt','10pt','11pt','12pt' );
var hgt = new Array( '18px' ,'19px','20px','21px','22px' );

var startSz = 1;

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++ )
		{
			if(cTags[ j ].id == "body_part")
			{
				cTags[ j ].style.fontSize = szs[ sz ];
				//cTags[ j ].style.lineHeight = hgt[ sz ];
			}
		}
	}
}