2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		6 Months Ended		545 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012
Numerator
Net loss, as reported	$ (1,557,278)	$ (2,929,923)	$ (5,143,819)	$ (5,798,992)	$ (112,772,103)
Less: Effect of amortization of interest expense on convertible notes	(2,936,576)	(4,637,024)	(2,936,576)	(4,637,024)
Net loss attributed to common stockholders (diluted)	$ (4,493,854)	$ (7,566,947)	$ (8,080,395)	$ (10,436,016)
Denominator
Weighted-average common shares outstanding	32,074,192	23,805,323	31,161,511	23,604,502
Denominator for diluted net loss per share	34,249,083	25,980,214	33,336,402	25,081,668
Basic net loss per share	$ (0.05)	$ (0.12)	$ (0.17)	$ (0.25)
Diluted net loss per share	$ (0.13)	$ (0.29)	$ (0.24)	$ (0.42)