// JavaScript Document
function checkprice (fPrice, tPrice) 

{
	if ( fPrice == '' || !isNumeric(fPrice) || tPrice == '' || !isNumeric(tPrice) ) {
		alert( 'Error: Both the "From Price" and the "To Price" must be valid numbers' );
		return false;
	}
	
	return true;
	
}

function isNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }