function trim(field)
{
	return true;
}

function getNumbersFromField(sNumericString)
{
	var sValidChars = "0123456789";
	var sChar;
	var sResult = "";
	var i;
	
	//Check that field is not blank
	if (sNumericString.length == 0) return "";
	
    //Loop through string and get numeric characters
	for (i = 0; i < sNumericString.length; i++)
	{
		sChar = sNumericString.charAt(i);
	    if (sValidChars.indexOf(sChar) >= 0)
	    {
	    	sResult = sResult + sChar;
	    }
	}
	
	return sResult;
}

function buildTxtMsgAddr(mobilePhoneNbr, providerSMSGateway)
{
	return getNumbersFromField(mobilePhoneNbr.value) + providerSMSGateway.options[providerSMSGateway.selectedIndex].value;
}