function checkEmail(frmName, itemName, msg)
{
	str=document.forms[frmName].elements[itemName].value;
	var supported = 0;
	var valid     = 0;
	if (window.RegExp) {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported) 
		valid=(str.indexOf(".") > 2) && (str.indexOf("@") > 0)
	else{
		var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)|(.*\")|(.*\\[|\\]|\\)|\\(|\\{|\\}|\\>|\\<|\\,|\\:|\\;|\\')|(.*\x7F)|(.*[\x01-\x20])");
		var r2 = new RegExp("^.+\\@(\\[?)(([a-zA-Z0-9\\-\\.])|([^a-zA-Z0-9]))+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");

		valid= (!r1.test(str) && r2.test(str));
		}

	if (!valid) {
		alert("Invalid "+msg);
		document.forms[frmName].elements[itemName].focus();
		return false;
		}
	return true;
}

function checkEmail2(frmName, itemName, msg)
{
	var v = document.forms[frmName].elements[itemName].value;
	var re = "^['_a-z0-9-]+(\.['_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.(([a-z]{2,3})|(aero|coop|info|museum|name))$";
	if (!v.match(re))
	{ 
		alert("Invalid "+msg);
		document.forms[frmName].elements[itemName].focus();
		return false;
	}
	return true;
}

function checkInt(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		var val;
		val=parseInt(document.forms[frmName].elements[itemName].value.replace(/,/g, ""));
		if (! isNaN(val)){
			document.forms[frmName].elements[itemName].value=val;
		}
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkHex(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		if (document.forms[frmName].elements[itemName].value.match(/^[0-9a-fA-F]*$/))
			return true;
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkFloat(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		var val;
		val=parseFloat(document.forms[frmName].elements[itemName].value.replace(/,/g, ""));
		if (! isNaN(val)){
			document.forms[frmName].elements[itemName].value=val;
		}
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkNotEmpty(frmName, itemName, msg)
{
	tmp_str=document.forms[frmName].elements[itemName].value;
	tmp_str=tmp_str.replace(/ /g,'');
	if ( tmp_str.length== 0)
	{
		alert(msg);
		document.forms[frmName].elements[itemName].focus();
		document.forms[frmName].elements[itemName].select();
		return false;
	}
	return true;
}

function preDelete()
{
	return confirm('Are you sure you want to delete this item?');
}

function CheckInteger(el)
{
 el.value=el.value.replace(/ +/g,''); 
 r=isNaN(el.value);
 rp=el.value.indexOf('.')

 if (r||rp!==-1)
 {
  alert ('Please enter number');
  el.focus();
	return false;
 }
	return true;
}
function form_submit(frmName,Separator,fieldsName,typesCheck,msgsText)
{pos1_b=0;
 pos1_e=0;
 pos2_b=0;
 pos2_e=0; 
 pos3_b=0;
 pos3_e=0;
 pos1_e=fieldsName.indexOf(Separator,0);
 pos2_e=typesCheck.indexOf(Separator,0);
 pos3_e=msgsText.indexOf(Separator,0)  
 result=true;
 while(pos1_e!==-1){
 field = fieldsName.substring(pos1_b,pos1_e);
 type  = typesCheck.substring(pos2_b,pos2_e);
 msg   = msgsText.substring(pos3_b,pos3_e);
 if (type=="Empty"){
 result=checkNotEmpty(frmName,field,msg)
 }
 
 if (!result){
 return false;
 }
// alert(field); alert(type); alert(msg);
 pos1_b=pos1_e+1;
 pos1_e=fieldsName.indexOf(Separator,pos1_b);
 pos2_b=pos2_e+1;
 pos2_e=typesCheck.indexOf(Separator,pos2_b);
 pos3_b=pos3_e+1;
 pos3_e=msgsText.indexOf(Separator,pos3_b);  
 }
return true;
}

function check_checkbox(el)
{ if (el.checked){
el.checked=false;
}
return true;
}

/////////////////////////////////////////////

function checkdate(object_value)
    {
    //Returns true if value is a date format or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is a date in the mm/dd/yyyy format
	isplit = object_value.indexOf('/');
	if (isplit == -1 || isplit == object_value.length)
		return false;
    sMonth = object_value.substring(0, isplit);
	if (sMonth.length == 0)
        return false;
	isplit = object_value.indexOf('/', isplit + 1);
	if (isplit == -1 || (isplit + 1 ) == object_value.length)
		return false;
    sDay = object_value.substring((sMonth.length + 1), isplit);
	if (sDay.length == 0)
        return false;
	sYear = object_value.substring(isplit + 1);
	if (!checkinteger(sMonth)) //check month
		return false;
	else
	if (!checkrange(sMonth, 1, 12)) //check month
		return false;
	else
	if (!checkinteger(sYear)) //check year
		return false;
	else
	if (!checkrange(sYear, 0, 9999)) //check year
		return false;
	else
	if (!checkinteger(sDay)) //check day
		return false;
	else
	if (!checkday(sYear, sMonth, sDay)) // check day
		return false;
	else
		return true;
    }
function checkday(checkYear, checkMonth, checkDay)
    {
	maxDay = 31;
	if (checkMonth == 4 || checkMonth == 6 ||
			checkMonth == 9 || checkMonth == 11)
		maxDay = 30;
	else
	if (checkMonth == 2)
	{
		if (checkYear % 4 > 0)
			maxDay =28;
		else
		if (checkYear % 100 == 0 && checkYear % 400 > 0)
			maxDay = 28;
		else
			maxDay = 29;
	}
	return checkrange(checkDay, 1, maxDay); //check day
    }

function checkinteger(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is an integer defined as
    //   having an optional leading + or -.
    //   otherwise containing only the characters 0-9.
	var decimal_format = ".";
	var check_char;
    //The first character can be + -  blank or a digit.
	check_char = object_value.indexOf(decimal_format)
    //Was it a decimal?
    if (check_char < 1)
	return checknumber(object_value);
    else
	return false;
    }

function numberrange(object_value, min_value, max_value)
    {
    // check minimum
    if (min_value != null)
	{
        if (object_value < min_value)
		return false;
	}
    // check maximum
    if (max_value != null)
	{
	if (object_value > max_value)
		return false;
	}
   //All tests passed, so...
    return true;
    }

function checknumber(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is a number defined as
    //   having an optional leading + or -.
    //   having at most 1 decimal point.
    //   otherwise containing only the characters 0-9.
	var start_format = " .+-0123456789";
	var number_format = " .0123456789";
	var check_char;
	var decimal = false;
	var trailing_blank = false;
	var digits = false;
    //The first character can be + - .  blank or a digit.
	check_char = start_format.indexOf(object_value.charAt(0))
    //Was it a decimal?
	if (check_char == 1)
	    decimal = true;
	else if (check_char < 1)
		return false;
   
	//Remaining characters can be only . or a digit, but only one decimal.
	for (var i = 1; i < object_value.length; i++)
	{
		check_char = number_format.indexOf(object_value.charAt(i))
		if (check_char < 0)
			return false;
		else if (check_char == 1)
		{
			if (decimal)		// Second decimal.
				return false;
			else
				decimal = true;
		}
		else if (check_char == 0)
		{
			if (decimal || digits)	
				trailing_blank = true;
        // ignore leading blanks

		}
	        else if (trailing_blank)
			return false;
		else
			digits = true;
	}	
    //All tests passed, so...
    return true
    }

function checkrange(object_value, min_value, max_value)
    {
    //if value is in range then return true else return false
    if (object_value.length == 0)
        return true;
    if (!checknumber(object_value))
	{
	return false;
	}
    else
	{
	return (numberrange((eval(object_value)), min_value, max_value));
	}
    //All tests passed, so...
    return true;
    }

	
function  check_interval(val_from,val_to)
    {
    if  ((val_from=="")||(val_to=="") )
        {
        alert("Invalid date")
        return false;
		} 

    if  (!checkdate(val_from))
		{
        alert("Invalid date")
            return false; 
		}
    if  (!checkdate(val_to))
		{
        alert("Invalid date")
            return false; 
		}
	var from = new Date (val_from);
	var to   = new Date (val_to);
	if (to < from)		
	{ alert("Invalid interval")
       return false; 
	}
	
		
    return true;
    }