function valida(contato){
	var frm = document.contato;
	var cont=0;
	for (var i = 0; i < frm.elements.length; i++){
		if ( (frm.elements[i].title.substr(0,1)) == "*" ){
			if (frm.elements[i].value == ""){
				frm.elements[i].style.backgroundColor = "#FDECE8";
				frm.elements[i].style.border = "1px solid #F9D3CA";
				cont = cont + 1;
			}else{
				frm.elements[i].style.backgroundColor = "#F4F2E8";
				frm.elements[i].style.border = "1px solid #ECE8D5";
			}
		}
	}
	if (cont == 0){
		return(true);
	} else {
		alert("Preenchimento obrigatório");
		return(false);
		
		
	}
}
function mostraImagem(imagem){
	var HttpReq = createXMLHTTP();
	HttpReq.open("GET", "thumb_400x300.php?" + imagem, true);
	HttpReq.onreadystatechange=function(){
		if(HttpReq.readyState == 1){
			document.getElementById('imgGrande').src = "img_lay/ajax-loader.gif";
		}
		if(HttpReq.readyState == 2){
			document.getElementById('imgGrande').src = "img_lay/ajax-loader.gif";
		}
		if(HttpReq.readyState == 3){
			document.getElementById('imgGrande').src = "img_lay/ajax-loader.gif";
		}
	
		if (HttpReq.readyState == 4 && HttpReq.status == 200){
        	document.getElementById('imgGrande').src = "thumb_400x300.php?" + imagem;
    	}
	}
	HttpReq.send(null);
}