function validateContact(){
   with (document.main){
      var problem = 0
      var message = ""
      if (firstname.value==""){
         problem++
         message+="\nFirst name is required."
      }    
	   if (lastname.value==""){
         problem++
         message+="\nLast name is required."
      }       
      if (!verifyEmail(email.value)){
         problem++
         message+="\nA valid email address is required."
      }               
         
      if (problem > 0){
         alert(message);
         return false;
      }
      else{
         return true;
      }
   }
}

function validateOrderForm(){
   with (document.main){
      var problem = 0
      var message = ""
	  if (hiddenorder.value==""){
         problem++
         message+="\nSelect a quantity for at least one item."
      }  
      if (Name.value==""){
         problem++
         message+="\nName is required."
      }  	   
      if (!verifyEmail(Email.value)){
         problem++
         message+="\nA valid email address is required."
      }   
	  if (Address.value==""){
         problem++
         message+="\nAddress is required."
      }  
         
      if (problem > 0){
         alert(message);
         return false;
      }
      else{
         return true;
      }
   }
}

function verifyEmail(addr) { 
    var atPos = addr.indexOf('@'); 
    var dotPos = addr.lastIndexOf('.') 
    if (atPos>0 && dotPos>atPos+1) return true; 
    else
       return false;
} 

function left(str, n){
   if (n <= 0)
       return "";
   else if (n > String(str).length)
       return str;
   else
       return String(str).substring(0,n);
}

function right(str, n){
    if (n <= 0)
       return "";
    else if (n > String(str).length)
       return str;
    else {
       var iLen = String(str).length;
       return String(str).substring(iLen, iLen - n);
    }
}