function Check_Nums(form) {
   if ((event.keyCode < 48) || (event.keyCode > 57))
   {
      return false;
   }
}
function Check_Float(form) {
   if (((event.keyCode < 48) && (event.keyCode != 46)) || (event.keyCode > 57))
   {
      return false;
   }
}
function Check_ISBN(form) {
   if (((event.keyCode < 48) && (event.keyCode != 40)&&(event.keyCode != 41)) || (event.keyCode > 57))
   {
      return false;
   }
}
function Check_Http(form) {
   if (((event.keyCode < 97) && (event.keyCode != 45)&& (event.keyCode != 95)
       && ((event.keyCode < 48) || (event.keyCode > 57))) || (event.keyCode > 122))
   {
      return false;
   }
}
function Check_Date(form) {
   if (((event.keyCode < 48) && (event.keyCode != 45)) || (event.keyCode > 57))
   {
      return false;
   }
}
function Check_upper(form) {
   if ((event.keyCode < 65) || (event.keyCode > 90))
   {
      return false;
   }
}
function Check_Maohao(form) {
   if (event.keyCode == 58)
   {
      return false;
   }
}
function Check_Space(form) {
   if ((event.keyCode == 32) || (event.keyCode == 42))
   {
      return false;
   }
}
function strlength(str)
{
   var l=str.length;
   var n=l
   for (var i=0;i<l;i++)
   {
     if (str.charCodeAt(i)<0 || str.charCodeAt(i)>255) n++
   }
   return n
}
function trim(s){
  return s.replace(/^\s+|\s+$/, '');
}
function now_date() {
  var today = new Date();
  var year = today.getYear();
  var month = today.getMonth()+1;
  var day = today.getDate();
  if (parseInt(month)<10) month = "0" + month;
  if (parseInt(day)<10) day = "0" + day;
  var nowdate=year+'-'+month+'-'+day;
  return nowdate;
}
function isDateString(sDate)
{
	  var iaMonthDays = [31,28,31,30,31,30,31,31,30,31,30,31]
    var iaDate = new Array(3)
    var year, month, day

    if (arguments.length != 1) return false
    iaDate = sDate.toString().split("-")
    if (iaDate.length != 3) return false
    if (iaDate[1].length > 2 || iaDate[2].length > 2) return false

    year = parseFloat(iaDate[0])
    month = parseFloat(iaDate[1])
    day=parseFloat(iaDate[2])

    if (year < 1900 || year > 2100) return false
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) iaMonthDays[1]=29;
    if (month < 1 || month > 12) return false
    if (day < 1 || day > iaMonthDays[month - 1]) return false
    return true
}
function  ForDight(Dight,How)
{
   Dight  =  Math.round  (Dight*Math.pow(10,How))/Math.pow(10,How);
   return  Dight;
}