var t=new Date();
var ms=t.getTime();

function calctime()
{
    var d=new Date();
    var m_s=d.getTime();
    var total=m_s-ms;
    total=total.toString();
    if(total<1000) {
        total="0."+total.substring(0,2);
    } else if(total>1000) {
        total=total.substring(0,1)+"."+total.substring(1,3);
    }
    document.getElementById('time_i').innerHTML=total+" seconds";
}