function chk_blank(ctl,msg)
	{
		if(msg=="")
		 {
		  msg="This field cannot be blank";
		 }
		if (ctl.value=="")
		 {
			alert(msg);
			ctl.focus();
			return (false);
		 }
		else
		 return (true);
	}

/*-----------------------------------------------------*/
//Valid Email Checking
function isEmailAddr(email)
  {
   var result = false
   var theStr = new String(email)
   var index = theStr.indexOf("@");
   if (index > 0)
    {
     var pindex = theStr.indexOf(".",index);
     if ((pindex > index+1) && (theStr.length > pindex+1))
     result = true;
    }
   return result;
  }
// Calling function
function chk_email(ctl,msg)
 {
 	if(msg=="")
	 {
	  msg="Please enter a valid email address";
	 }

	if (!isEmailAddr(ctl.value))
	 {
		alert(msg);
		ctl.value="";
		ctl.focus();
		return (false);
	 }
	else
	 return (true);
 }
/*-----------------------------------------------------*/

// Numeric checking
function chk_numeric(ctl,msg)
 {
 	if(msg=="")
	 {
	  msg="Please enter valid numeric data";
	 }

	if (isNaN(ctl.value))
	 {
		alert(msg);
		ctl.value="";
		ctl.focus();
		return (false);
	 }
	else
	 return (true);
 }
/*-----------------------------------------------------*/

function checkemail(str) {
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}