<!-- Begin

function ClearForm(form){
    form.weight.value = "";
    form.height.value = "";
    form.bmi.value = "";
    form.my_comment.value = "";
}
function bmi(weight, height) {
          bmindx=weight/eval(height*height);
          return bmindx;
}
function checkform(form) {
       if (form.weight.value==null||form.weight.value.length==0 || form.height.value==null||form.height.value.length==0){
            alert("\nJe moet wel alles invullen hoor!");
            return false;
       }

       else if (parseFloat(form.height.value) <= 40||
                parseFloat(form.height.value) >=500||
                parseFloat(form.weight.value) <= 2||
                parseFloat(form.weight.value) >=500||
				isNaN(parseFloat(form.height.value))||
				isNaN(parseFloat(form.weight.value))){
                alert("\nOeps, je getallen kloppen niet! \nVul het juist in. \nJe gewicht in kg en \nje lengte in cm.");
                ClearForm(form);
                return false;
       }
       return true;
}
function computeform(form) {
       if (checkform(form)) {
       yourbmi=Math.round(bmi(form.weight.value, form.height.value/100));  
	   var url = "bmiresult.html?weight="+form.weight.value+"&height="+form.height.value+"&bmi="+yourbmi;
	   var win = window.open(url,"BMI","width=644,height=720,menubar=no,toolbar=no,scrollbars=yes,resizable=yes");
       }
       return;
}
function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
}


// End -->