When I click togglediv, commentdiv must be visible or hidden. The following code is running on Firefox but not Internet Explorer:  
$(document).ready(function(){
    $("#togglediv").click(function(){ 
        if( $("#commentdiv").is(":visible") ) {
            $("#commentdiv").hide("slow");
            $("#togglediv").text("show");
        } else {
            $("#commentdiv").show("slow");
            $("#togglediv").text("hide");
        }
    });
});
                There is a function toggle in jquery that does exactly what you want without having to check for visibility:
$("#commentdiv").toggle("slow");
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