document.addEventListener("mousemove", function()
{
var mouseX = event.clientX+'px';
var mouseY = event.clientY+'px';
});
var product = "21" * "2"; //в результате получится число 42.
<input type="button" id="b1" value="Btn 1">
<input type="button" id="b2" value="Btn 2">
<script>
document.getElementById('b1').disabled = false;
document.getElementById('b2').disabled = true;
</script>
calendar.selectDate = function(day, month, year) {
calendar.selectedDate = {
'Day': day,
'Month': month,
'Year': year
};
calendar.drawCalendar(month, year);
document.getElementById('test_type').innerHTML = day+'-'+month+'-'+year;
}