function chkFormular() {
	if((document.mailform.name.value != "") && (document.mailform.company.value != "") && (document.mailform.tel.value != "") && (document.mailform.email.value != "")){
		if(!validEmail(document.mailform.email.value)){
    			document.getElementById("chk-email").style.display = "block";
    			if(document.getElementById("error-text")) document.getElementById("error-text").style.display = "none";
    			document.mailform.email.focus();
    			return false;
    		}
    		else return true;
    	}
}

function validEmail(email) {
	var strReg = "^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$";
	var regex = new RegExp(strReg);
	return(regex.test(email));
}

function trackKeys(evnt,regEx) {
   	var keyCode = evnt.keyCode ? evnt.keyCode : evnt.which;
 	return !!String.fromCharCode(keyCode).match(regEx) || keyCode>36 && keyCode<41 || keyCode==8 || keyCode==46;
}