String.prototype.isValidEmail = function(){
	return !!this.match(/^([a-zA-Z0-9]{1}([a-zA-Z0-9|.|-|_]*)[a-zA-Z0-9]{1})@([a-zA-Z0-9]{1}([a-zA-Z0-9|.|-|_]*)[a-zA-Z0-9]{1})\.([a-zA-Z]{2,4})$/)
}

		function check(formType) {
			if (formType=="infoletter") {
				if (!document.forms.infoletter.epostadress.value.isValidEmail()) {
					flashinfoletter(5);
					alert("\nKontrollera e-postadressen!\n");
					return false;
				} else {
					document.forms.infoletter.submit();
				}
			}
			
		}
		
		
		function flashinfoletter(time) {
				if (!document.getElementById) return alert('Kontrollera e-postadressen');
				document.getElementById('epostadress').focus();
				document.getElementById('epostadress').style.backgroundColor=time%2?'#CC0001':'#ffffff';
				if (time) setTimeout('flashinfoletter('+(time-1)+')',100);
			}