<button id="the_button" onclick="clicked()">&darr; Source &darr;</button>

function clicked() {
    if ($("#the_button").html() == "&darr; Source &darr;") {
        alert($("#the_button").html());
    }
}

<button id="the_button" onclick="clicked()">Source</button>

function clicked() {
    if ($("#the_button").html() == "Source") {
        alert($("#the_button").html());
    }
}