// JavaScript Document

function ltrim ( s )
{
return s.replace( /^\s*/, "" )
}
function rtrim ( s )
{
return s.replace( /\s*$/, "" );
}
function trim ( s )
{
return rtrim(ltrim(s));
}

/*
  to check if a field is empty
*/
function checkEmpty(value)
{
  if(trim(value) == "")
  {
    return false;
  }
}

/*
  to check if
*/
function checkMaxCharLimit(value,maxLimit)
{
  if(trim(value).length > maxLimit)
  {
    return false;
  }
}

/*
  to check if
*/
function checkMinCharLimit(value,minLimit)
{
  if(trim(value).length < minLimit)
  {
    return false;
  }
}

/*
  to check if value is a numeric.
  checks for whole number
*/
function checkNumeric(n)
{
	var number = trim(n);
    digits='0123456789 ';
	for(i=0;i<number.length;i++)
	{
		j=number.charAt(i);
		if (digits.indexOf(j)<0)
		{
			return false;
		}
	}
}

/*
  to check if a number is float
*/
function checkFloat(n)
{
	var number = trim(n);
    digits='0123456789. +-';
	for(i=0;i<number.length;i++)
	{
		j=number.charAt(i);
		if (digits.indexOf(j)<0)
		{
			return false;
		}
	}
}

/*
  to check if correct value in combo is selected
*/
function checkComboSelection2(index,validIndex)
{
    if(index==validIndex)
	{
		return false;
	}
}

/*
  to check if correct value in combo is selected
*/
function checkComboSelection(value)
{
    if((value=="SELECT")||(value=="-------------------------")||(value=="Month") ||  (value=="0"))
	{
		return false;
	}
}

/*
  to check if the date is correct
  checks if date is empty and valid
  checks if month is empty and valid
  checks if year is empty
*/
    function checkDate(d, m, y)
	{
		var day = trim(d);
		var month = m;
		var year = trim(y);

		if(checkMinCharLimit(year,4))
			return false;

    	var err=0
    	if (month<1 || month>12) err = 1
    	if (day<1 || day>31) err = 1
    	if (day==31 && (month==4 || month==6 || month==9 || month==11)) err=1


        	if (month==2) {


            		if ((year%4==0) && (year%100!=0 || year%400==0)) {
            			if (day>29) err=1


                		} else {
                			if (day>28) err=1
                		}
                	}
                	if (day == "" || month == "" || year == "") err=1


                    	if (err==1) {
                    		return false
                    	}
                    	return true
 }

/*
	to check on lenght of textarea and restrict the text length
*/
function checkLength(field,txtInfo,num)
{
    if(checkMaxCharLimit(txtInfo,num)==false)
    {
        txtInfo = txtInfo.substring(0,num-1);
        alert(field+" can not be more than "+num+" characters");
		return false;
    }
	else
	{
		return true;
	}
}

function checkTextArea(txtInfo)
{
	var num=1000;
    if(checkMaxCharLimit(txtInfo,num)==false)
    {
        txtInfo = txtInfo.substring(0,num-1);
        alert("Text exceeds "+num+" characters");
		return false;
    }
	else
	{
		return true;
	}
}

function checkEmail(t)
{
	//a=eval(t);
	myreg=/[@](.)+[.]/; 
	
	if(!myreg.test(t))	
		return false;	
	else
		return true;

}