function esDigito(sChr){
var frm = document.forms[1];
var sCod = sChr.charCodeAt(0);
return ((sCod > 47) && (sCod < 58));
}
function valSep(oTxt){
var bOk = false;
bOk = bOk || ((oTxt.value.charAt(2) == "-") && (oTxt.value.charAt(5) == "-"));
bOk = bOk || ((oTxt.value.charAt(2) == "/") && (oTxt.value.charAt(5) == "/"));
return bOk;
}
function finMes(oTxt){
var nMes = parseInt(oTxt.value.substr(3, 2), 10);
var nRes = 0;
switch (nMes){
case 1: nRes = 31; break;
case 2: nRes = 29; break;
case 3: nRes = 31; break;
case 4: nRes = 30; break;
case 5: nRes = 31; break;
case 6: nRes = 30; break;
case 7: nRes = 31; break;
case 8: nRes = 31; break;
case 9: nRes = 30; break;
case 10: nRes = 31; break;
case 11: nRes = 30; break;
case 12: nRes = 31; break;
}
return nRes;
}
function valDia(oTxt){
var bOk = false;
var nDia = parseInt(oTxt.value.substr(0, 2), 10);
bOk = bOk || ((nDia >= 1) && (nDia <= finMes(oTxt)));
return bOk;
}
function valMes(oTxt){
var bOk = false;
var nMes = parseInt(oTxt.value.substr(3, 2), 10);
bOk = bOk || ((nMes >= 1) && (nMes <= 12));
return bOk;
}
function valAno(oTxt){
var bOk = true;
var nAno = oTxt.value.substr(6);
//bOk = bOk && ((nAno.length == 2) || (nAno.length == 4));
bOk = bOk && ((nAno.length == 4) && (parseFloat(nAno)>=1900));
if (bOk){
for (var i = 0; i < nAno.length; i++){
bOk = bOk && esDigito(nAno.charAt(i));
}
}
return bOk;
}
function valFecha(oTxt){
var bOk = true;
if (oTxt.value != ""){
bOk = bOk && (valAno(oTxt));
bOk = bOk && (valMes(oTxt));
bOk = bOk && (valDia(oTxt));
bOk = bOk && (valSep(oTxt));
if (!bOk){
alert("Fecha invalida");
oTxt.value = "";
oTxt.focus();
}
}
return bOk
}
function verifica(obj){
flag = true;
if (obj.value==""){
	alert("Ingrese una fecha");
	obj.focus();
	return false
}
flag = flag && (valAno(obj));
flag = flag && (valMes(obj));
flag = flag && (valDia(obj));
flag = flag && (valSep(obj));
if (!flag){
	alert("Fecha no valida");
	obj.focus();
	return false
	}
}
function getXMLHTTPRequest() {
var req;
try {
req = new XMLHttpRequest();
} catch(err1) {
try {
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch (err2) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch (err3) {
req = false;
}
}
}
return req;
}

function disabledRightButton(){
	var message="";
	function clickIE() {if (document.all) {(message);return false;}}
	function clickNS(e) {if 
	(document.layers||(document.getElementById&&!document.all)) {
	if (e.which==2||e.which==3) {(message);return false;}}}
	if (document.layers) 
	{document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;}
	else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;}
	document.oncontextmenu=new Function("return false")
}