function mypopup(thatUrl,thatWidth,thatHeight,thatName)
	{
		var xPos = (screen.width-thatWidth)/2;
		var yPos = (screen.height-thatHeight)/2;

		mywindow = window.open (thatUrl,thatName,",status=no,scrollbars=0,left="+xPos+",top="+yPos+",screenX="+xPos+",screenY="+yPos+",width="+thatWidth+",height="+thatHeight);
	}



    function trim(value) {
        var temp = value;
        var obj = /^(\s*)([\W\w]*)(\b\s*$)/;
        if (obj.test(temp)) { temp = temp.replace(obj, '$2'); }
        var obj = / +/g;
        temp = temp.replace(obj, " ");
        if (temp == " ") { temp = ""; }
        return temp;
    }
    
    function isEmail(x)
    {
        var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
        return filter.test(x);
    }
    
    function checkForm(form) {
        form.modtager_navn.value = trim(form.modtager_navn.value);
        form.modtager_email.value = trim(form.modtager_email.value);
        form.afsender_navn.value = trim(form.afsender_navn.value);
        form.afsender_email.value = trim(form.afsender_email.value);
        if (form.modtager_navn.value.length == 0) {
            alert('Du mangler at indtaste navn på modtager.');
            form.modtager_navn.focus();
            return false;
        }
        if (form.modtager_email.value.length == 0) {
            alert('Du mangler at indtaste email-adresse på modtager.');
            form.modtager_email.focus();
            return false;
        }
        if (!isEmail(form.modtager_email.value)) {
            alert('Du skal indtaste en gyldig email-adresse. Prøv igen.');
            form.modtager_email.focus();
            return false;
        }
        if (form.afsender_navn.value.length == 0) {
            alert('Du mangler at indtaste dit eget navn.');
            form.afsender_navn.focus();
            return false;
        }
        if (form.afsender_email.value.length == 0) {
            alert('Du mangler at indtaste din egen email-adresse.');
            form.afsender_email.focus();
            return false;
        }
        if (!isEmail(form.afsender_email.value)) {
            alert('Du skal indtaste en gyldig email-adresse. Prøv igen.');
            form.afsender_email.focus();
            return false;
        }
        return true;
    }

    function checkFrontpageForm(form) {
        form.email.value = trim(form.email.value);
        form.navn.value = trim(form.navn.value);
        form.postNr.value = trim(form.postNr.value);

        if (form.email.value.length == 0) {
            alert('Du mangler at indtaste din email-adresse.');
            form.email.focus();
            return false;
        }
        if (!isEmail(form.email.value)) {
            alert('Du skal indtaste en gyldig email-adresse. Prøv igen.');
            form.email.focus();
            return false;
        }
        if (form.navn.value.length == 0) {
            alert('Du mangler at indtaste dit navn.');
            form.navn.focus();
            return false;
        }
        if (form.postNr.value.length == 0) {
            alert('Du mangler at indtaste dit postnummer.');
            form.postNr.focus();
            return false;
        }
        return true;
    }