How to add days to given date and print them from start to end date in javascript

Hi All,

My problem is how to add certain days to the given date and how to print those dates in a loop.
Please help me , I am trying to do something like below:
function printdate() {
var selectedstartDate = (document.getElementById('<%=txtdate.ClientID%>').value)
var mydatecounter = parseInt(document.getElementById('<%=txtcounter.ClientID%>').value)
var myDate = new Date(selectedstartDate);

var targetdate = newdate.setDate(myDate + mydatecounter) ;
for(var Date =selectedstartDate ; Date< targetdate ; Date++) {
document.write(Date );

}
}

Regards,
Jayesh(From India,Mumbai)