Statement of Cash Flows (USD $)	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Cash flows from operating activities:
Net loss for the period	$ (925,718)	$ (1,430,257)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	30,841	34,509
Amortization of intangible assets	280,880	208,473
Stock-based compensation	244,261	300,485
Share purchase warrants	0	136,934
Shares issued as part of share purchase plan	0	7,941
Change in fair value of derivative liability	(145,714)	0
Foreign exchange loss	(687)	28,046
Accretion of debenture discount	159,798	0
Changes in assets and liabilities:
Accounts receivable	599,061	(116,599)
Other current assets	24,927	78,323
Decrease in other assets	(29,229)	(7,117)
Accounts payable and accrued liabilities	(387,661)	(132,963)
Unearned revenue	(188,252)	70,987
Customer deposits	65	(3,109)
Accrued warranty	(22,967)	5,848
Net cash used in operating activities	(360,395)	(818,499)
Cash flows from investing activities:
Purchase of equipment	(671)	(28,457)
Deposits	(1,021)	661
Net cash used in investing activities	(1,692)	(27,796)
Cash flows from financing activities:
Common stock issued, net of transaction costs	5,857,404	15,802
Convertible debentures issued	0	483,300
Net cash provided by financing activities	5,857,404	499,102
Foreign exchange effect on cash	26,760	369
Increase (decrease) in cash	5,522,077	(346,824)
Cash, beginning of the period	1,707,397	1,556,813
Cash, end of the period	7,229,474	1,209,989
Supplemental disclosure of cash flow information
Interest	$ 5,297	$ 221