function changeTo(form_field, text_checked, text_changeTo)
{
	if(form_field.value==text_checked)
	{
		//window.alert("por: "+text_checked+" na: "+text_changeTo);
		form_field.value=text_changeTo;	
	}
} 

function checkForm (form)
{
	var ok=true;
	for(var i=0;i<form.length;i++)
	{
		if(form.elements[i].value == "")
		{
			alert("Please write something.");
	        form.elements[i].focus();
	        ok=false;
		}
		if(form.elements[i].name == "email" && ((form.email.value.indexOf("@") == -1) || (form.email.value.charAt(0) == ".") || (form.email.value.charAt(0) == "@") || (form.email.value.length< 6) || (form.email.value.indexOf(".") == -1) || (form.email.value.charAt(form.email.value.indexOf("@")+1) == ".") || (form.email.value.charAt(form.email.value.indexOf("@")-1) == ".")))
		{
			alert("Please correct your e-mail.");
	    	form.email.focus();
    	    ok=false;
		}
	}
	if(ok)
	{
		form.submit();
		//alert("Thank you for your e-mail.");
	}
}