I don't understand the if{} statement

I don't understand the if{} statement

I made a clock in my webpage woth this code, it works fine, but I would like to know what does the if{} statment in this code, I don't understand what is it doing. Can someone help me please? :D

I made a clock in my webpage woth this code, it works fine, but I would like to know what does the if{} statment in this code, I don't understand what is it doing. Can someone help me please? :D

<script type="text/javascript">
function startTime(){
    today=new Date();
    h=today.getHours();
    m=today.getMinutes();
    s=today.getSeconds();
    m=checkTime(m);
    s=checkTime(s);

document.getElementById('reloj').innerHTML=h+":"+m+":"+s; t=setTimeout('startTime()',500);} function checkTime(i){ if (i<10) {i="0" + i}return i;} window.onload=function(){startTime();} </script>


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