function check_blank(o1, comment)
{
	var obj1 = document.all(o1);
	if (obj1.value=="")
	{
		window.alert(comment);
		if(!obj1.disabled)obj1.focus();
		return false;
	}
	else return true;
}

function check_email(o1, comment) {
	obj1 = document.all(o1);
	email = obj1.value;
	ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";

	for(i=0; i < email.length ;i++) {
		if(ok.indexOf(email.charAt(i))<0) { 
			window.alert(comment);
			if(!obj1.disabled)obj1.focus();
			return false;
		}
	} 

	if (document.images) {
		re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
		re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
		if (!email.match(re) && email.match(re_two)) {
			return (-1);
		} 
	}
}

function check_num_ch(str) {
  if(!str) return false;
  for(var i=0; i<str.length; i++){
    var ch=str.charAt(i);
    if ("0123456789abcdefghijklmnopqrstvuwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_".indexOf(ch) ==-1) return false;
  }
  return true;
} 

function check_number(obj) {
  if(!obj) return false;
  str = obj.value;
  for(var i=0; i<str.length; i++){
    var ch=str.charAt(i);
    if ("0123456789".indexOf(ch) ==-1) {
		return_str = str.substr(0,str.length - 1);
		obj.value = return_str;
		return false;
	}
  }
  return true;
} 

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
// mm/dd/yyyy
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
	return true
}

function check_date(str_date, comment) {
	// yyyy/mm/dd
	date_c = str_date.split("/");
	d_date = date_c[2];
	m_date = date_c[1];
	y_date = date_c[0];
	if (!isDate(m_date + "/" + d_date + "/" + y_date)) {
		window.alert(comment);
		return false;
	}
	else return true;
}