function controlform()
{
	ok=true;
	emailerap=document.getElementById("emailerror");
	pstar=document.getElementById("starerror");
	txtname=document.getElementById("tfname");
	txtemail=document.getElementById("tfemail");
	txttext=document.getElementById("tftext");
	ername=document.getElementById("errorname");
	eremail=document.getElementById("erroremail");
	ertext=document.getElementById("errortext");
	ername.style.visibility="hidden";
	eremail.style.visibility="hidden";
	ertext.style.visibility="hidden";
	if(txtname.value=="")
	{	
		ername.style.visibility="visible";
		ok=false;
	}
		if(txtemail.value=="")
	{	
		eremail.style.visibility="visible";
		ok=false;
	}

		if(txttext.value=="")
	{	
		ertext.style.visibility="visible";
		ok=false;
	}
	
	
	var status = false;     
	var emailRegEx = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i;
	 if (txtemail.value.search(emailRegEx) == -1)
		{
				emailerap.style.visibility="visible";
				ok=false;
		}
		else
		{

				emailerap.style.visibility="hidden";
		}


	return ok;
}