//JScript


    //Check valid credit card
     function isCreditCard( CC ) 
     {                         
          if (CC.length > 19 || CC.length < 16)
               return (false);

          sum = 0; mul = 1; l = CC.length;
          for (i = 0; i < l; i++) 
          {
               digit = CC.substring(l-i-1,l-i);
               tproduct = parseInt(digit ,10)*mul;
               if (tproduct >= 10)
                    sum += (tproduct % 10) + 1;
               else
                    sum += tproduct;
               if (mul == 1)
                    mul++;
               else
                    mul--;
          }
          if ((sum % 10) == 0)
               return (true);
          else
               return (false);
     }
     
     
     //Check blank fields
     function isBlank(obj)
     {
        
        if (obj.toString().length < 3 || obj == null || obj=='')
            return true;
        else 
            return false;
     }
     
     //Check expiration date
    function checkCCDate(month,year)
    {
    
        var today = new Date();
      

        if (month < (today.getMonth() + 1) && year <= today.getFullYear())
            return false;
        
        if (year < today.getFullYear())
            return false;
            
    }
    
    function isEmail(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					
    }
    
    function isPhoneNumber(obj)
    {
        
    
    
    }