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function check_date(date)
{
var mmddyy, mm, dd, yy;
var current_date = new Date();
var days = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var valid = true;
if (date.value.length == 0)
return true;
mmddyy = date.value.split('/');
mm = Number(mmddyy[0]);
dd = mmddyy.length > 1? Number(mmddyy[1]) : 1;
yy = mmddyy.length > 2? Number(mmddyy[2]) : current_date.getFullYear();
if (isNaN(mm) || isNaN(dd) || isNaN(yy))
valid = false;
if (valid)
{
if ((yy % 4 == 0 && yy % 100 != 0) || yy % 400 == 0)
days[1] = 29;
if (mm < 1 || mm > 12 || dd < 1 || dd > days[mm - 1] || yy < 1996 || yy > 2100)
valid = false
}
if (valid)
{
date.value = mm + '/' + dd + '/' + yy;
return true;
}
else
{
alert(check_date_msg);
date.focus();
return false;
}
}