function sub() {

	var mail;
	var str = document.send.email.value;
	mail = str.indexOf("@",0);
	if (mail!=0 && mail!= -1) {
		mail = str.indexOf(".",mail+2);
		if(mail!= -1 && mail<(str.length-1)) {
		mailok = 1; 
		} else mailok = 0;
	} else mailok = 0;
	
	if(!mailok){
		alert("Invalid E-mail format!");
		return false;
	}
		
			
	if(document.send.email.value == '' ||
		document.send.name.value == '' ||
		document.send.message.value == '') {
		  alert('Fill all area marked *!');
		  return false;
	  }
	
	return true;		   
}