function ValidMe() {
    if (document.form_main.name.value=="") {
 	    	alert('Please enter your name.');
 	    	document.form_main.name.focus();
 	    	return false;
 	} else if (document.form_main.email.value=="") {
 	    	alert('Please enter your email address.');
 	    	document.form_main.email.focus();
 			return false;
 	} else if (!IsEmailValid(document.form_main.email)) {
 	    	alert('Invalid email format.');
 	    	document.form_main.email.focus();
 	    	return false;
 	} else if (document.form_main.tel.value=="") {
 	    	alert('Please enter your telephone number.');
 	    	document.form_main.tel.focus();
 			return false;
 	} else if (document.form_main.message.value=="") {
 	    	alert('Please enter your message.');
 	    	document.form_main.message.focus();
 			return false; 	
 	} else {
		document.form_main.submit();
 		return true;
 	}   
}