function changeFontSize(inc) {
	var p = document.getElementsByTagName('p');
 
	for ( n=0; n<p.length; n++ ) {
		if ( (p[n].id != 'p-welcome-message') && (p[n].id != 'p-link-login') && (p[n].id != 'p-blog-author') ) {  
			if(p[n].style.fontSize) {
				var size = parseInt(p[n].style.fontSize.replace("px", ""));
			} else {
				var size = 12;
			}
			p[n].style.fontSize = size+inc + 'px';
		}
	}
}