Derivative Liabilities (Details 1) (USD $)	9 Months Ended	12 Months Ended		12 Months Ended
Apr. 30, 2013	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012 Warrant [Member]	Jul. 31, 2011 Warrant [Member]	Jul. 31, 2010 Warrant [Member]	Jul. 31, 2011 Warrant [Member] Minimum [Member]	Jul. 31, 2011 Warrant [Member] Maximum [Member]
Current exercise price	$ 0.03	$ 0.15	$ 0.25	$ 0.15			$ 0.15	$ 0.25
Time to expiration	3 years 4 months 13 days	3 years 10 months 24 days		3 years 10 months 24 days	4 years 8 months 12 days
Risk-free interest rate	0.50%	0.45%		0.45%	1.23%
Estimated volatility	88.00%	104.00%		104.00%	108.00%
Dividend	0.00%	0.00%		0.00%	0.00%
Stock price at period end date	$ 0.026	$ 0.093		$ 0.093	$ 0.13	$ 0.4

Agreed upon price for the exchange of the underlying asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

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