var win = null;
function abre(url,windowname,w,h){
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;		
	
	win = window.open("foto.asp?foto="+url,windowname,"height="+(h)+",width="+(w)+",top="+wint+",left="+winl+",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0");
	win.window.focus();
}
function somente_numeros(){
if (event.keyCode < 48 || event.keyCode > 57) event.returnValue = false;
}
function autoTab(input,len, e) {
	var isNN = (navigator.appName.indexOf("Netscape")!=-1);	
	var keyCode = (isNN) ? e.which : e.keyCode; 
	var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
	if(input.value.length >= len && !containsElement(filter,keyCode)) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
		}
	function containsElement(arr, ele) {
		var found = false, index = 0;
		while(!found && index < arr.length)
			if(arr[index] == ele)
			found = true;
			else
			index++;
			return found;
	}
	function getIndex(input) {
		var index = -1, i = 0, found = false;
		while (i < input.form.length && index == -1)
			if (input.form[i] == input)index = i;
			else i++;
			return index;
		}
	return true;
}