function calcAge(a,b,c){if(a==''||b==''){yearsOld='bad'}else{dDate=parseInt(a,10);dMonth=parseInt(b,10);dYear=parseInt(c,10);if(isNaN(dDate)||dDate<1)return'badDate';if(isNaN(dMonth)||dMonth<1)return'badMonth';if(isNaN(dYear)||dYear<1)return'badYear';curDate=new Date();yearsOld=curDate.getFullYear()-dYear;monthsOld=(curDate.getMonth()+1)-dMonth;daysOld=curDate.getDate()-dDate;if((monthsOld<0)||(monthsOld==0&&daysOld<0))yearsOld--;if(yearsOld<0)yearsOld='badYear'}return yearsOld}function checkAge(){birthMonth=$('select[name=ageMonth]').val();birthDate=$('select[name=ageDate]').val();birthYear='19'+$('input[name=ageYear]').val();dAge=calcAge(birthDate,birthMonth,birthYear);if(dAge=='bad'||dAge=='badYear'||dAge=='badMonth'||dAge=='badDate'){if(dAge=='bad'){alert("Aub. alle velden invullen")}else if(dAge=='badDate'){alert("Voer een geldige dag in")}else if(dAge=='badMonth'){alert("Voer een geldige maand in")}else if(dAge=='badYear'){alert("Voer een geldig jaar in")}return false}else{if(dAge<18){alert('Sorry, om www.dommelsch.nl te bezoeken moet je 18 jaar of ouder zijn.');return false}$('input[name=age]').val('18plus');return true}return false}