function vacio(q) {
        for ( i = 0; i < q.length; i++ ) {
                if ( q.charAt(i) != " " ) {
                        return true
                }
        }
        return false
}
function valida(F)
{        
	        if( vacio(F.NAME.value) == false ) 
		{
                alert("Please, write your NAME or the name of your COMPANY.")
                return false
        } 
		else if( vacio(F.SUBJECT.value) == false ) 
		{
                alert("Please, write a SUBJECT for your message.")
                return false
        } 
		else  if( vacio(F.MESSAGE.value) == false ) 
		{
                alert("Please, write a message or the reason of your contact.")
                return false
        } 
		else  if( vacio(F.EMAIL.value) == false ) 
		{
                alert ("Please, wirte your CONTACT EMAIL")
                return false
        } 
		else
		{
                alert ("Thanks!! form has been filled out correctly")
				return true
        }   
}