Error : expecting ] token after element when using ajax.get

I keep getting an error when i run the debugger that says "SyntaxError: missing ] after element list"

the first request always works as intended but all of the follow requests return a syntax error. can someone explain to me what i'm messing up here. please and thankyou.

    var clientmsg = $("#usermsg").val();  
    $.post("post.php", {text: clientmsg});                
    $("#usermsg").attr("value", "");  
    return false;  
        url : '',
        type : 'GET', 
            success : function(data)
                document.getElementById('chatframe').innerHTML = data; 
        }), 500);  



your setInterval is wrong, it should be, setInterval(func, delay[, param1, param2, ...]); like

setInterval(ajax_func, 500);

function ajax_func() {
        url : '',
        type : 'GET', 
        success : function(data) {
            document.getElementById('chatframe').innerHTML = data; 

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