// set up a Date object
var cdate = new Date();

// get the current date
var cday = cdate.getDate();

// set the display date
var cdday = (cday < 10) ? "0" + cday : cday;

// open the select wrapper
document.write("<select name=\"start_day\" id=\"start_day\">\n");

for(i=1; i<32; i++) {

	var theday = (i < 10) ? "0" + i : i;

	if (i == cday) {
		// write a selected menu entry
		document.write("<option value=\"" + theday + "\" selected=\"selected\">" + theday + "</option>\n");
	} else {
		// write an unselected menu entry
		document.write("<option value=\"" + theday + "\">" + theday + "</option>\n");
	}
}

// close the select wrapper
document.write("</select>\n");