function calctal2() {
var x = document.getElementById('tal_current2')
.value;
var b = document.getElementById('ihit')
.value;
var i = x;
x = x - 1;
var a = 100 + (x + 1) * 100;
for (i = b; i >= 0; i = i - a) {
x++;
a = 100 + x * 100
}
document.getElementById('talend')
.innerHTML = x
}