your function call never terminates, try
<script language="javascript">
var y="";
var i=1.0;
var imax = 100.0;
function ddd()
{
i=i+1;
y=i;
document.write(y+"<br>");if (i < imax)
ddd();
}
ddd();
</script>
or
<script language="javascript">
var y="";
var i=300;
function ddd()
{
for (var j=0; j < i; j++)
document.write((j+2)+"<br>");
}
ddd();
</script>
<script language="javascript">
var y="";
var i=1.0;
var imax = 100.0;
function ddd()
{
i=i+1;
y=i;
document.write(y+"<br>");if (i < imax)
ddd();
}
ddd();
</script>
or
<script language="javascript">
var y="";
var i=300;
function ddd()
{
for (var j=0; j < i; j++)
document.write((j+2)+"<br>");
}
ddd();
</script>
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