function checkEmail (email) {
    if( email=="" ) return false;
    
    var regExpr = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,})+$/;
    return regExpr.test(email);
}

function checkContactForm() {
    document.getElementById("message").style.backgroundColor = '#FFFF99';
    document.getElementById("email").style.backgroundColor = '#FFFF99';
    document.getElementById("subject").style.backgroundColor = '#FFFF99';
    document.getElementById("firstname").style.backgroundColor = '#FFFF99';
    document.getElementById("lastname").style.backgroundColor = '#FFFF99';

       

    if (!document.getElementById("message")) {
        document.getElementById("message").style.backgroundColor = '#ff403b';
        return false;
    }
	    if (!document.getElementById("firstname")) {
        document.getElementById("firstname").style.backgroundColor = '#ff403b';
        return false;
    }
	    if (!document.getElementById("lastname")) {
        document.getElementById("lastname").style.backgroundColor = '#ff403b';
        return false;
    }

    if (!document.getElementById("email")) {
        document.getElementById("email").style.backgroundColor = '#ff403b';
        return false;
    }

    var isError = false;

    if (document.getElementById("message").value == 0) {
            document.getElementById("message").style.backgroundColor = '#ff403b';
            isError = true;
    }
    if (document.getElementById("firstname").value == 0) {
            document.getElementById("firstname").style.backgroundColor = '#ff403b';
            isError = true;
    }
    if (document.getElementById("lastname").value == 0) {
            document.getElementById("lastname").style.backgroundColor = '#ff403b';
            isError = true;
    }
	
  
    if (document.getElementById("subject").value == '0') {
        document.getElementById("subject").style.backgroundColor = '#ff403b';
        isError = true;		
    }


    var msgText = document.getElementById("message").value;
    var emailText = document.getElementById("email").value;

    if (msgText.length == 0) {
        document.getElementById("message").style.backgroundColor = '#ff403b';
    }
	
    

    if (!checkEmail(emailText)) {
        document.getElementById("email").style.backgroundColor = '#ff403b';
    }

    if (!checkEmail(emailText) || msgText == "") {
        //document.getElementById("error_div").style.display="block";
        isError = true;
    }

    if (isError) return false;

    return true;
}

function checkFreeSampleForm() {
    if (!document.getElementById("address")) return false;
    if (!document.getElementById("email")) return false;
    
    var msgText = document.getElementById("address").value;
    var emailText = document.getElementById("email").value;
    
    if (!checkEmail(emailText) || msgText == "" || msgText == "") {
        document.getElementById("error_div").style.display="block";
        return false;
    }

    return true;
}