You're missing parameters in your Find A Class request. Here's some help to get you started...

Parameter	Value	Description
all_classes	false	show open classes only
all_classes	true (default)	show all classes (opened and closed)
mode[]	HY	Hybrid classes
mode[]	IN	Online or Internet classes
keywords	free form	all purpose text search
subject_code[]	course prefix	search by course prefix. ie. ENG
terms[]	SIS term	search by semester or term. ie. 4114 for Summer 1 2011
honors_only	true	Honors classes
session	OEE	Open Entry/Open Exit Classes

NOTE: any parameter ending in [] can be used multiple times in a query. 

Help Guide for Term Codes:

term codes are 4 digit numbers that specify the term or semester in SIS. Here is a breakdown of what each digit corresponds to:

1st digit: Always a 4.
2nd and 3rd digits: The last 2 number of the year. ie. 11 for 2011.
4th digit: 2 is for Spring; 4 is for Summer 1; 5 is for Summer 2; 6 is for Fall

   example: 4116 is the code for Fall 2011
   example: 4126 is the code for Fall 2012
   example: 4136 is the code for Fall 2013

**Remember to update the year (reflected by the second two numbers) in the four digit code!**

FAC example queries

This example queries for all hybrid classes in the current term.
http://www.cgc.maricopa.edu/services/technology-support/webmaster/Pages/FindAClass.aspx?mode[]=HY

This example queries for  ENG classes, open classes only, in the Fall 2011 term.
http://www.cgc.maricopa.edu/services/technology-support/webmaster/Pages/FindAClass.aspx?subject_code[]=ENG&all_classes=false&terms[]=4116