function checkForNumeric(field){
// only allow numbers to be entered
var checkOK = "0123456789";
var checkStr = field.value;
var allValid = true;
var allNum = "";

//var lastChar = checkStr.substring(checkStr.length-1,checkStr.length);
//var tempChar = checkStr.substring(0,checkStr.length-1);

for (i = 0; i < checkStr.length; i++){
	ch = checkStr.charAt(i);
	
	for (j = 0; j < checkOK.length; j++)
	
	if (ch == checkOK.charAt(j)){
		break;
	}
	if (j == checkOK.length){
		allValid = false;
		break;
	}
	if (ch != ",")
		allNum += ch;
	}
	if (!allValid){
		//alert("Please check your entry...it contains non numeric characters");
		//var lastChar = checkStr.substring(checkStr.length-1,checkStr.length);
		var tempChar = checkStr.substring(0,checkStr.length-1);
		
		//alert(tempChar);
		field.value = tempChar;
		return (false);
	}
}