function checkTextBoxes() {
    var url, ok_color, error_color, i, postForm;
    
    error_color = "#fae7e0";
	ok_color = "#FFFFFF";
	postForm = true;
		
    var naam = new Array("ctl00_cphBody_ctlContact_txtNaam","rqrNaam","textbox");
    var email = new Array("ctl00_cphBody_ctlContact_txtEmail", "rqrEmail", "email");
    var bericht = new Array("ctl00_cphBody_ctlContact_txtBericht", "rqrBericht", "textbox");
    
    var fields = new Array(naam, email, bericht);

    
    for(i = 0; i < fields.length; i++) {
        var temp = fields[i];
        
        switch(temp[2])
        {
            case "textbox":
                if (document.getElementById(temp[0]).value.length < 1) {
                    document.getElementById(temp[1]).innerHTML = "(*)";
                    document.getElementById(temp[0]).style.backgroundColor = error_color;
                    postForm = false;
                }   
                else {
                    document.getElementById(temp[1]).innerHTML = "(*)";
                    document.getElementById(temp[0]).style.backgroundColor = ok_color;
                }
            break;
            
            case "datum":
                if(document.getElementById(temp[0]).value.length < 8) {
                    document.getElementById(temp[1]).innerHTML = "(*)";                        
                    document.getElementById(temp[0]).style.backgroundColor = error_color;
                    postForm = false;                    
                }
                else {
                    if (isDate(document.getElementById(temp[0]))) {
                        document.getElementById(temp[1]).innerHTML = "";
                        document.getElementById(temp[0]).style.backgroundColor = ok_color;
                    }
                    else {
                        document.getElementById(temp[1]).innerHTML = "(*)";                        
                        document.getElementById(temp[0]).style.backgroundColor = error_color;
                        postForm = false;
                    }
                }
            break;
            
            case "email":          
                if (!validateEmail(document.getElementById(temp[0]).value)) {
                    document.getElementById(temp[1]).innerHTML = "(*)";   
                    document.getElementById(temp[0]).style.backgroundColor = error_color;
                    postForm = false;                     
                }
                else {
                    document.getElementById(temp[1]).innerHTML = "(*)";
                    document.getElementById(temp[0]).style.backgroundColor = ok_color;
                }
            break;
            
            case "username":
                if (document.getElementById(temp[0]).value.length < 6) {
                    document.getElementById(temp[1]).innerHTML = "(*)"; 
                    document.getElementById(temp[0]).style.backgroundColor = error_color; 
                    postForm = false;  
                }
                else {
                    document.getElementById(temp[1]).innerHTML = "";   
                    document.getElementById(temp[0]).style.backgroundColor = ok_color;
                }
            
            break;
            
            case "password":
                
            break;
        }
    }
    
    return postForm;
}

function validateEmail(strEmail) {
    var reg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/; // not valid
    var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/; // valid
   
  	if (!reg1.test(strEmail) && reg2.test(strEmail)) { // if syntax is valid
    	return true;
  	}
  	else {
  	    return false;
  	}
}

// * DHTML date validation script for dd/mm/yyyy. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
// */
//// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2007;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31;
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30;}
		if (i==2) {this[i] = 29;}
   } 
   return this;
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12);
	var pos1=dtStr.indexOf(dtCh);
	var pos2=dtStr.indexOf(dtCh,pos1+1);
	var strDay=dtStr.substring(0,pos1);
	var strMonth=dtStr.substring(pos1+1,pos2);
	var strYear=dtStr.substring(pos2+1);
	strYr=strYear;
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
	}
	month=parseInt(strMonth);
	day=parseInt(strDay);
	year=parseInt(strYr);
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : dd/mm/yyyy");
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month");
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day");
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear);
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date");
		return false;
	}
    return true;
}