function ValidateEmail(txt){
	//regular expression
	var b=/^[A-Za-z][A-Za-z0-9_]*@[A-Za-z0-9_]+\.[A-Za-z0-9_.]+[A-za-z]$/;
	return b.test(txt);
}

function Validate( varname, varemail, varinvalidemail, varcaptcha){
	if(document.getElementById('name').value.length==0){
		alert(varname);
		document.getElementById('name').focus;
		return(false);
	}
	if(document.getElementById('email').value.length==0){
		alert(varemail);
		document.getElementById('email').focus;
		return(false);
	}
	if(document.getElementById('email').value.length>0){
		if (!ValidateEmail(document.getElementById('email').value)){
			alert(varinvalidemail);
			document.getElementById('email').focus;
			return(false);
		}
	}
	if(document.getElementById('security').value.length==0){
		alert(varcaptcha);
		document.getElementById('security').focus;
		return(false);
	}
	
	return(true);
}