Redirect when using 'onclick' with an input element

There is nothing wrong with the redirection because I ran jun the redirection part of your code,

<script type="text/javascript">
function agreeprint()
{
    window.location = "/index";   //The redirection is not working
}
</script>

<input type="submit" onclick="javascript:agreeprint();" value="Proceed">

and it works perfectly. There must be something wrong with the javascript before the redirection:

if($("#company").val()==''||$("#office_address").val()=='')
    {
        alert('<?php echo $this->translate('Please enter the empty field values'); ?>');
        return false;
    }
    else
    {
        var companyval  = $("#company").val();
        var officeaddrval = $("#office_address").val();
        $.ajax({
            type: "POST",
            url: "/index/agreement",
            data: $( "form" ).serialize(),
            success: function(msg){
                if(msg.substr(0,9)=='contratt_')
                location.href = '/filename/'+msg;
            }
        }); 
    }

Judging from the errors that I was getting when I ran the code I am guessing that there is a problem with your AJAX because I got a odd POST error when I ran the code and I also discovered that there is a missing ")" but I am not familiar with AJAX so I am just guessing,

SyntaxError: missing ) after argument list

I hope this helps, Conor.