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need help with a simple single field javascript login form

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hello i need help with a simple javascript simple login form, i am building a small website for I and my classmates. i want it to be able to redirect each user to a specific page when a corresponding passcode is entered, i know its unsafe but we dont plan on keeping valuable information on the site, i dont know about MSQL and dont even wish to use it, the code works at this level but am unable to add users since i dont understand javascript if someone could help me i will be very grateful
thanks in advance
/*here is the code i got so far*/<tittle>Enter Passcode to proceed</title><h1 style="font-family:Comic Sans Ms;text-align="center";font-size:20pt;color:#00FF00;></h1><form name="login">Passcode: <input type="text" name="userid"/><input type="button" onclick="check(this.form)" value="Login"/><input type="reset" value="Cancel"/></form><script type="text/javascript">function check(form)/*function to check userid */{ /*the following code checkes whether the entered userid is correct*/ if(form.userid.value == "JohnDoe") {    window.open("johndoe.php")/*opens the target page while Id */  } else {   alert("Invalid Passcode, please try again!")/*displays error message*/  }}</script>


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It's not just "unsafe", it provides absolutely zero security, honestly. For what it's worth you might as well have a list of links to each corresponding page and ask them politely not to visit pages that don't correspond to them.

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