function do_small(){
	var ran_number=Math.ceil(Math.random()*5);
	document.write('<a href=\"http://www.deanjohnson.com\" target=\"_blank\">');
	document.write('<img src=\"http://www.deanjohnson.com/djd_ads/254x130_' + ran_number + '.jpg\">');
	document.write('</a>');
}

function do_horizontal(){
	var ran_number=Math.ceil(Math.random()*4);
	document.write('<a href=\"http://www.deanjohnson.com\" target=\"_blank\">');
	document.write('<img src=\"http://www.deanjohnson.com/djd_ads/514x130_' + ran_number + '.jpg\">');
	document.write('</a>');
}

function do_vertical(){
	var ran_number=Math.ceil(Math.random()*4);
	document.write('<a href=\"http://www.deanjohnson.com\" target=\"_blank\">');
	document.write('<img src=\"http://www.deanjohnson.com/djd_ads/169x434_' + ran_number + '.jpg\">');
	document.write('</a>');
}