I know it can be changed in the css file, but this may help.
http://kellyinfo.com/MyFiles/zipfiles/fontcss.zip
try changing
h1 {
text-align: left;
font-size: 75px;
}
h2 {
text-align: left;
font-size: 45px;
}
h5 {
text-align: left;
font-size: 36px;<------to 26 or smaller.
}
it's located in the all.css which will change all h5 tags specs