<!--

	function uncheck(name1, name2) {

	 if(name1.checked) {

	  name2.checked = false;

	 } else {

	  name2.checked = true;

	 }

	}

	
	function checkbox_toggle(chbx, hiddenfield, aan_value, uit_value) {

	 //hiddenfield = "document.Form1."+hidden_name;

	 //window.alert(hiddenfield);

	 
	 if (chbx.checked) {

	  hiddenfield.value = aan_value;

	 } else {

	  hiddenfield.value= uit_value;

	 }

	}

	
	function CheckNumber(checkString) {

		newString = "";

		count = 0;

		
		for (i = 0; i < checkString.length; i++) {

			ch = checkString.substring(i, i+1);

			if ((ch >= "0" && ch <= "9") || (ch == ".") || (ch == ",")) {

				newString += ch;

			}

		}

		if (checkString != newString) {

			res = false; 

		} else {

			res = true;

		}

		
		if (checkString.length ==0) {

			res = false; 

		}

	return res

	}


  function CheckEmail(address) {

    return address.match(/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/gi);

  }


  function daysInFebruary(year) {

		return (  ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );

  }


  function CheckDate(name) {

    var daysInMonth = new Array(0,31,28,31,30,31,30,31,31,30,31,30,31);


    el_month = eval("document.Form1."+name+"Month")

    el_day = eval("document.Form1."+name+"Day")

    el_year = eval("document.Form1."+name+"Year")

		
		if (el_day.value == '-1') return false;

		if (el_month.value == '-1') return false;

		if (el_year.value == '-1') return false;    

    
    month = el_month.options[el_month.selectedIndex].value;

    day = el_day.options[el_day.selectedIndex].value;

    year = el_year.options[el_year.selectedIndex].value;


    // Explicitly change type to integer to make code work in both

    // JavaScript 1.1 and JavaScript 1.2.

    var intYear = parseInt(year);

    var intMonth = parseInt(month);

    var intDay = parseInt(day);


    // catch invalid days, except for February

    if ((intMonth != 2) && (intDay > daysInMonth[intMonth])) return false;


    if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;


    return true;

  }


  function CheckForm(theForm) {

    result=true;


    if (theForm.email.value == "") {

      window.alert("U dient een e-mail adres in te vullen");

      theForm.email.focus();

      result=false;

    } else if (theForm.email.value!="" && !CheckEmail(theForm.email.value)) {

      window.alert("Dit e-mail adres is niet geldig!");

      theForm.email.focus();

      result=false;

    }  

				   else if (theForm.email.value == "") {

					 	window.alert("Dit veld mag niet leeg zijn: 'email'");

					 	theForm.email.focus();

					 	result=false;

				   }

				   
				   else if (theForm.naam.value == "") {

					 	window.alert("Dit veld mag niet leeg zijn: 'naam'");

					 	theForm.naam.focus();

					 	result=false;

				   }

				   
		if(result) {

			theForm.submit();

		}

  }


//-->