// checking for string is empty or not

whitespace = "\t \n\r";

function chkNumeric(objName)
{

var checkOK = "0123456789.";
var checkStr = objName;
var allValid = true;
var allNum = "";
var ch;

for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
{
allValid = false;
break;
}
//if (ch != ",")
//allNum += ch;
}
if (!allValid)
{
alertsay = "Please enter only these values \""
alertsay = alertsay + checkOK + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}

// set the minimum and maximum
var chkVal = allNum;
var prsVal = parseInt(allNum);
if (chkVal != "" && !(prsVal >= minval && prsVal <= maxval))
{
alertsay = "Please enter a value greater than or "
alertsay = alertsay + "equal to \"" + minval + "\" and less than or "
alertsay = alertsay + "equal to \"" + maxval + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}
}

function chkNumber(objName)
{

var checkOK = "0123456789";
var checkStr = objName;
var allValid = true;
var allNum = "";
var ch;

for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
{
allValid = false;
break;
}
//if (ch != ",")
//allNum += ch;
}
if (!allValid)
{
alertsay = "Please enter only these values \""
alertsay = alertsay + checkOK + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}

// set the minimum and maximum
var chkVal = allNum;
var prsVal = parseInt(allNum);
if (chkVal != "" && !(prsVal >= minval && prsVal <= maxval))
{
alertsay = "Please enter a value greater than or "
alertsay = alertsay + "equal to \"" + minval + "\" and less than or "
alertsay = alertsay + "equal to \"" + maxval + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}
}


function chkAlphanumeric(objName)
{
var checkOK = "._ABCDEFGHIJKLMNOPQRSTUVWXYZ ";
var checkStr = objName;
var allValid = true;
var allNum = "";
var ch;
checkStr=checkStr.toUpperCase();

for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);

for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
{
allValid = false;
break;
}
//if (ch != ",")
//allNum += ch;
}
if (!allValid)
{
alertsay = "Please enter only these values \""
alertsay = alertsay + checkOK + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}

// set the minimum and maximum
var chkVal = allNum;
var prsVal = parseInt(allNum);
if (chkVal != "" && !(prsVal >= minval && prsVal <= maxval))
{
alertsay = "Please enter a value greater than or "
alertsay = alertsay + "equal to \"" + minval + "\" and less than or "
alertsay = alertsay + "equal to \"" + maxval + "\" in the \"" + checkStr.name + "\" field."
//alert(alertsay);
return (false);
}
}
function IsEmpty(aTextField){
         if(trim(aTextField.value)==''){
			return true;
	   }
}
function isEmptyString(s,msg,formname,controlname)
{
   	var i;
	if((s == null) || (s.length == 0)){
		 alert(msg);
		 document.formname.controlname.focus();
		 return false;
	}	 
	return false;
  	for(i=0;i < s.length;i++)
  	{
  		var currchar = s.charAt(i);
  		if(whitespace.indexOf(currchar) == -1){			 return false;		}	 
  	}
    return true;
}
function trim( str ) {
	// Immediately return if no trimming is needed
	if( (str.charAt(0) != ' ') && (str.charAt(str.length-1) != ' ') ) { return str; }
	// Trim leading spaces
	while( str.charAt(0)  == ' ' ) {
		str = '' + str.substring(1,str.length);
	}
	// Trim trailing spaces
	while( str.charAt(str.length-1)  == ' ' )
	{
		str = '' + str.substring(0,str.length-1);
	}

	return str;
}

function isEmail(n)
{
		if (isEmptyString(n)) return false;
		var i=1;
		var nLength=n.length;
		while((parseInt(i) < parseInt(nLength)) && (n.charAt(parseInt(i)) != '@'))
		{
			i++;
		}
		if ((parseInt(i) >= parseInt(nLength)) || (n.charAt(i)!="@"))
		{
			return false;	
		}	
		else i+=2;
		while((i<nLength) && (n.charAt(i)!="."))
		{
			i++;
		}
		if ((i>=nLength-1) || (n.charAt(i)!="."))
		{
			return false;	
		}	
		else return true;		
}
function chkPhoneNumeric(objName)
{

var checkOK = "0123456789-().";
var checkStr = objName;
var allValid = true;
var allNum = "";

for (i = 0;  i < checkStr.length;  i++)
{
	ch = checkStr.charAt(i);
	for (j = 0;  j < checkOK.length;  j++)
		if (ch == checkOK.charAt(j))
			break;
	if (j == checkOK.length)
	{
	allValid = false;
	break;
	}
//if (ch != ",")
//allNum += ch;
}
if (!allValid)
{
	alertsay = "Please enter only these values \""
	alertsay = alertsay + checkOK + "\" in the \"" + checkStr.name + "\" field."
	//alert(alertsay);
	return (false);
}
}