//Copyright RealGo, Inc. 2002 All Rights Reserved
function isMLSNumber(number) {
    return (isInteger(number, 100000, 999999) || isInteger(number, 1000, 9999));
}     


function isPrice(value) {
    if (value == null) return false;
    var testChar;
    for (var i=0; i<value.length; i++) {
        testChar = value.charAt(i);
        if ( ! (isDigit(testChar) || testChar == '$' || testChar == ',') ) {
            return false;
        }
    }
    return true; 
}     

function isInteger(number, minVal, maxVal) {
    if (number == null) return false;
    for (var i=0; i<number.length; i++) {
        if ( ! isDigit(number.charAt(i)) ) {
            return false;
        }
    }
    if (arguments.length >= 2 && number < minVal) {
        return false;
    }

    if (arguments.length >= 3 && number > maxVal) {
        return false;
    }

    return true;    
}

function isString(testStr, minLen, maxLen) {
    if (testStr == null) return false;
    var len = trim(testStr).length;
    if (len <= 0) return false;
    
    if (arguments.length >= 2 && len < minLen) {
        return false;
    }

    if (arguments.length >= 3 && len > maxLen) {
        return false;
    }

    return true;     
}

function isWhiteSpace(c) {
    if (c == ' ' || c == '\t' || c == '\n') {
        return true;
    }
    return false;
}        

function isDigit(n) {
    if (n == '0' || n == '1' || n == '2' || n == '3' || n == '4' ||
        n == '5' || n == '6' || n == '7' || n == '8' || n == '9' ) {
        return true;
    }
    
    return false;
}

function ltrim(s) {
    var len = s.length;
    for (var i=0; i<len; i++) {
        if (!isWhiteSpace(s.charAt(i))) {
            return s.substring(i,len);
        }
    }
    return "";
}

function rtrim(s) {
    var len = s.length;
    for (var i=len-1; i>=0; i--) {
        if ( !isWhiteSpace(s.charAt(i)) ) {
            return s.substring(0,i+1);
        }
    }
    return "";        
}

function trim(s) {
    return rtrim(ltrim(s));
}

function selectedCount(selectRef) {
    var count = 0;
    for (var i=0;i<selectRef.length;i++) {
        if (selectRef.options[i].selected) {
            count++;
        }
    }  
    return count > 0;
}   

function checkValidDate(year,month,day,dateString)
{
    month = month - 1; /*goofy javascript thing*/
    var test = new Date(year,month,day);
    
    if ( (test.getFullYear() == year) && (month == test.getMonth()) && (day == test.getDate()) ) {
        return true;                    
    } else {
        alert(dateString + " is not a valid date!");
        return false;
    }
 }
        
/*
 Check that a field's value validates against a function fct.
 Extra parameters to fct can be supplied as arguments after the fct pointer.
 Returns error as passed in with new errors added. 
*/
function checkField(errors, field, errMsg, fct) {
    if (field == null) return errors; //Ignore null fields, it probably isn't defined for this form
    
    if (trim(field.value) != 0) {
        var args = "";
        if (arguments.length > 4 ) {
            args = buildArgs(arguments, 4);
        }

        if ( eval("fct(field.value" + args + ")") == false) {
            return errors.concat(errMsg);
        }
    } else {
        //Don't enforce required here
        return errors;
    }
    
    return errors;                
}

function checkRequiredField(errors, field, errMsg, fct) {
    if (field == null) return errors; //Ignore null fields, it probably isn't defined for this form
    
    if (trim(field.value) != 0) {
        var args = "";
        if (arguments.length > 4 ) {
            args = buildArgs(arguments, 4);
        }

        if ( eval("fct(field.value" + args + ")") == false) {
            return errors.concat(errMsg);
        }
    } else {
        //Required
        return errors.concat(errMsg);
    }
    
    return errors;                    
}

function buildArgs(args, startArg) {
    var returnArgs = "";
    for(var i=startArg; i<args.length; i++) {
        returnArgs += ', ' + args[i];
    }
    return returnArgs;
}