Shouldn't This Function Accept Multiple Parameters?

I'm probably missing something simple here. I have this function called display:

function display(name3,office3,officePH3,mobile3,email3)
{
document.getElementById('viewer').src=('Location_Files/')+(office3)+('.htm')
}

It's supposed to take 5 values and do various things with them. When I only had one parameter it worked fine, it took an office number which was the value of a listbox option and turned it into a path and then pointed an iframe to that path. Then I changed it so the value of the listbox option was 5 parameters separated by commas. Here's the listbox now:

<select onchange="display(this.value)" multiple="multiple" id="People" name="People" style="border-style: none; height:260px; width:220px;">
<option value="test name,1656,phone,NONE,email">Loading</option>
</select>

You can see display is executed as "display(this.value)" so in theory it should take "test name,1656,phone,NONE,email" as its parameters and it should accept 1656 as the "office3" parameter. For some reason it's not working out that way, the function executes and the iframe changes but I get an unable to display webpage message like the path is broken. Can anyone see what I'm doing wrong?