// JavaScript Document

function ValidaData(objeto) 
{

	var DataString	= objeto.value;
	var DataArray	= DataString.split("/");  
	var Flag=true; 

	if (DataArray.length != 3) 
		Flag=false; 
	else 
		{
			if (DataArray.length==3) 
			{
				var dia = DataArray[0], mes = DataArray[1], ano = DataArray[2]; 

				if (((Flag) && (ano<1000) || ano.length>4)) 
					Flag=false; 
				
				if (Flag) 
				{ 
					verifica_mes = new Date(mes+"/"+dia+"/"+ano); 
					if (verifica_mes.getMonth() != (mes - 1)) 
						Flag=false; 
				} 
			} 
			else 
				Flag=false; 
		} 
return Flag;
} 
function FormataData(objeto,teclapress)
{
	var tecla = teclapress.keyCode;

	if(((window.event.keyCode == 13) || (window.event.keyCode == 9))&&objeto.value != "")
	{
		if(!(ValidaData(objeto)))
			{
				window.event.cancelBubble = true;
				window.event.returnValue = false;
				alert("Data Inválida");
				objeto.value = "";
				objeto.focus();
			}
	}

	if (( tecla == 8 || tecla == 88 || tecla >= 48 && tecla <= 57 || tecla >= 96 && tecla <= 105 )&& objeto.value.length < (10))
    {
		vr = objeto.value;
		vr = vr.replace( "/", "" );
		vr = vr.replace( "/", "" );
		tam = vr.length;

		if (tam < 8)
			{
				if (tecla != 8) {tam = vr.length + 1 ;}
			}
		else
			{
				window.event.cancelBubble = true;
				window.event.returnValue = false;
			}
		
		if ((tecla == 8) && (tam > 1))
			{
				tam = tam - 1 ;
				objeto.value = vr.substr(0,tam);
				window.event.cancelBubble = true;
				window.event.returnValue = false;
			}
				if ( tam <= 4 && tecla != 8){ 
			 		objeto.value = vr ; }

				if ( (tam >= 4) && (tam <= 6) ){
			 		objeto.value = vr.substr(0, tam - 4) + '/' + vr.substr( tam - 4, 4 ); }

				if ( (tam >= 6) && (tam <= 8) ){
					objeto.value = vr.substr(0, tam - 6 ) + '/' + vr.substr( tam - 6, 2 ) + '/' + vr.substr( tam - 4, 4 ); }

				if ((tam == (8)) && tecla != 8)
					{
						if(tecla >=96 && tecla <=105)
							{
								tecla = tecla - 48;
							}

						objeto.value = objeto.value + (String.fromCharCode(tecla));
						window.event.cancelBubble = true;
						window.event.returnValue = false;

						if (!(ValidaData(objeto)))
							{
								alert("Data Inexistente!");
								objeto.value = "";
								objeto.focus();
							}
					}
	}
	else if((window.event.keyCode != 8) && (window.event.keyCode != 9) && (window.event.keyCode != 13) && (window.event.keyCode != 35) && (window.event.keyCode != 36) && (window.event.keyCode != 46))
		{
			event.returnValue = false;
		}
}