<script type="text/javascript">
var click = false;

function changeSnowStateOnClick()
{
    if(click==true)
    {
        snowStorm.stop();
        click = false;
    }
    else
    {
        snowStorm.resume();
        click = true;
    }
}

function changeText() {
    var button_snow = document.getElementById('button_snow');
    if (button_snow.innerText.match("Wlacz snieg")) {
        document.getElementById('button_snow').innerText = 'Wylacz snieg';
        snieg=1;
    } else {
        document.getElementById('button_snow').innerText = 'Wlacz snieg';
        snieg=0;
    }
}

</script>
<a href="#" class="register bradius" id="button_snow" style="background-color:#3399FF;" onclick="changeText()"><i class="fa fa-cloud fa_xtra" aria-hidden="true"></i>Wylacz snieg</a>