Posting iframe with code

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Javascript

IFrame

Hello,

My aim is to authenticate users in two systems at the same time. One is mine. I developed it. Second one is in different server and i don't know how to authenticate my users on it, cookies etc.

So i decide to post login page of Second one with auto filling necessary fields.

I have my login page which is used to authentication of my system. I put an invisable iframe here and link it to second system login page.

Now i'm trying to fill iframe login fields(userid, pw) from parent page and post parent and iframe at the same time but i cannot make it with javascript.

I cannot even try " document.frames[0].document.form[0].submit()" and etc because i can't write this script( intellisense don't let it. I don't know why. I'am using VS2010 by the way)

I will be appreciated for your help about posting iframes or communicating iframes elements or another solution about authenticating to two system at the same time. (I'm using ASP.NET)


Thanks.