To change the size of the text using your wheel mouse: 

Hold down the CTRL button on your keyboard
Scroll the wheel on your mouse up to decrease size of text
Scroll the wheel on your mouse down to increase the size of text
To use you mouse to navigate back and fourth between pages instead of the buttons:

Hold down the Shift button on your keyboard
Scroll the wheel on your mouse up to navigate forward one page
Scroll the wheen on your mouse down to navigate back one page

All of the above tips require a mouse with a scroll wheel.