function wrestSaupja(fld) 
{ 
   if (!wrestTrim(fld)) return; 
   var pattern = /(^[0-9]{10}$)/; 
   if (!pattern.test(fld.value)) { 
	   if (wrestFld == null) { 
		   wrestMsg = wrestItemname(fld) + " : 사업자등록번호를 10자리 숫자로 입력하십시오.\n"; 
		   wrestFld = fld; 
	   } 
   } else {

		var sum = 0;
		var at = 0;
		var att = 0;
		var saupjano= fld.value;
		sum = (saupjano.charAt(0)*1)+
			  (saupjano.charAt(1)*3)+
			  (saupjano.charAt(2)*7)+
			  (saupjano.charAt(3)*1)+
			  (saupjano.charAt(4)*3)+
			  (saupjano.charAt(5)*7)+
			  (saupjano.charAt(6)*1)+
			  (saupjano.charAt(7)*3)+
			  (saupjano.charAt(8)*5);
		sum += parseInt((saupjano.charAt(8)*5)/10);
		at = sum % 10;
		if (at != 0) { att = 10 - at;  }
		if (saupjano.charAt(9) != att) {
		   wrestMsg = wrestItemname(fld) + " : 올바른 사업자등록번호가 아닙니다.\n"; 
		   wrestFld = fld; 
		}

	}
}