Stuck on very easy JavaScript Calculate Function

[MikeyJamJams]

Hi. I've been creating a very simple test HTML form that utilizes javascript. All I have on the form is a dropdown, with three options: 1, 2, and 3. Then, I have a submit button. When pressed, a message is supposed to be displayed to the screen saying "You selected option1!" etc.

However, what happens, is that it loops through everything, so I see:
"You selected option1"
"You selected option2"
"You selected option3"

I don't understand why it is looping. I don't use any looping functions. My code below is:

<form name="form1">
<select name="dropdown1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>

<input type="button" value="Submit" onClick="calculate()">
</form>

<script>
function calculate()
{

var audience;
audience=document.form1.dropdown1.options[document.form1.dropdown1.selectedIndex].value;

if(audience="1")
{
window.alert("You have selected option " + audience);
}

if(audience="2")
{
window.alert("You have selected option " + audience");
}

if(audience="3")
{
window.alert("You have selected option " + audience");
}

}


</script>


I'm completely baffled as to why it goes through every if statement and generates each message, if someone could help lend a hand.

Thanks,
Mikey

[JMRKER]

Change each if statement to:

if (audience == "1") ...

if (audience == "2") ...

if (audience == "3") ...

[MikeyJamJams]

I can't believe that was it... Haha. I feel like such a dumb@ss now. Thanks for your help, though!