function invalidField(theField,theDesc,Req) {
	// Check for Required Field
	var returnValue = false

	if ((trim(theField.value) == "" || (theField.value == "SS")) && (Req == "Y" || Req == "Q"))
  	{
  	alert("Please enter a value for the " + theDesc + " field.");
	theField.focus();
   	returnValue = true;
   	return returnValue
  	}


}



function trim(strText) { 
    // this will get rid of leading spaces 
    while (strText.substring(0,1) == ' ') 
        strText = strText.substring(1, strText.length);

    // this will get rid of trailing spaces 
    while (strText.substring(strText.length-1,strText.length) == ' ')
        strText = strText.substring(0, strText.length-1);

   return strText;
} 





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){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function ValidateForm(thefield){
	
	if (isDate(thefield.value)==false){
                thefield.focus()
		return true
	}
    return false
 }








  //

  // IsNumeric - returns true if a string is a valid numeric literal

  //

  function IsNumeric(thefield,theDesc) {
    var decCnt = 0;
    var idx = 0;

    var ch = "";
    var number = thefield.value 
    for (idx = 0; idx < number.length; idx++) {



      ch = number.substring(idx, idx + 1 );
      
      
      if ((ch < "0") || (ch > "9"))  {
      
      
      
      		if (decCnt > 0)
      		{
       			{ 		
      			alert("Enter a numeric value for " + theDesc + " field.");
	  			thefield.focus();
	  			}

      		
      			returnValue = true
        		return returnValue      		

			} 
      
      
      
      		if (ch == ".") {
      		{ 		
              returnValue = false
              decCnt ++
	  		}
      		
      		
      		} // first if true part
            else
  			{    
      
      
      
      
      
      
      

      		{ 		
      		alert("Enter a numeric value for " + theDesc + " field.");
	  		thefield.focus();
	  		}

      		
      		returnValue = true
        	return returnValue 

            } // second else false part

      } // for first if true part
      else
      
      
      {
        returnValue = false
	

      } // for first else else part

    } // for idx


//Error Checking for character being a period

if (idx == 1 && ch == ".")
{
       			{ 		
      			alert("Enter a numeric value for " + theDesc + " field.");
	  			thefield.focus();
	  			}

      		
      			returnValue = true
        		return returnValue      		


}
return returnValue
}



function DateCorrect(theField,theDesc,Req)
{

	if ((theDesc == "Day" && theField.value == "Day") && (Req == "Y" || Req == "Q"))
  	{
  	alert("Please enter a value for the " + theDesc + " field.");
	theField.focus();
   	returnValue = true;
   	return returnValue
  	}


	if ((theDesc == "Year" && theField.value == "Year") && (Req == "Y" || Req == "Q"))
  	{
  	alert("Please enter a value for the " + theDesc + " field.");
	theField.focus();
   	returnValue = true;
   	return returnValue
  	}



	if ((theDesc == "Mon" && theField.value == "Mon") && (Req == "Y" || Req == "Q"))
  	{
  	alert("Please enter a value for the " + "Month field.");
	theField.focus();
   	returnValue = true;
   	return returnValue
  	}



}