function verificaUpload(form, extensoes, obrigatorio, tamanhoMaximo) {
	var minWidth="";
	var minHeight="";
	var maxWidth="";
	var maxHeight="";
	var saveWidth="";
	var saveHeight="";
	
	var allUploadsOK = true;
	document.MM_returnValue = false;
	for (var i = 0; i < form.elements.length; i++) {
		field = form.elements[i];
		if (!field.type || field.type.toUpperCase() != 'FILE') {
			continue;
		}
		checkOneFileUpload(field,extensoes,obrigatorio,tamanhoMaximo,minWidth,minHeight,maxWidth,maxHeight,saveWidth,saveHeight);
		if (!field.uploadOK) {
			allUploadsOK = false;
			break;
		}
	}
	if (allUploadsOK) {
		document.MM_returnValue = true;
	}
	showProgressWindow();
}

function checkOneFileUpload(field, extensoes, obrigatorio, tamanhoMaximo, minWidth, minHeight, maxWidth, maxHeight, saveWidth, saveHeight) {
	var fileName = field.value.replace(/"/gi,'');
	field.uploadOK = false;
	if (fileName == '') {
		if (obrigatorio) {
			alert('Escolha um arquivo!');
			field.focus();
			return;
		} else {
			field.uploadOK = true;
		}
	} else {
		if (extensoes != '') {
			checkFileExtension(field, fileName, extensoes);
		} else {
			field.uploadOK = true;
		}
		if (!document.layers && field.uploadOK) {  
			document.PU_uploadForm = field.form;
			re = new RegExp("\.(gif|jpg|png|bmp|jpeg)$","i");
			if(re.test(fileName) && (tamanhoMaximo != '' || minWidth != '' || minHeight != '' || maxWidth != '' || maxHeight != '' || saveWidth != '' || saveHeight != '')) {
				checkImageDimensions(field,tamanhoMaximo,minWidth,minHeight,maxWidth,maxHeight,saveWidth,saveHeight);
			}
		}
	}
	return;
}

function checkFileExtension(field, fileName, extensoes) {
	var re = new RegExp("\\.(" + extensoes.replace(/,/gi,"|").replace(/\s/gi,"") + ")$","i");
	var agt = navigator.userAgent.toLowerCase();
	var is_mac = (agt.indexOf("mac") != -1);
	var is_op = (agt.indexOf("opera") != -1);
	if (is_op) {
		var ext = fileName.substring(fileName.lastIndexOf('.')+1, fileName.length);
		var extArr = extensoes.split(',');
		var extCheck = false;
		for (var i = 0; i < extArr.length; i++) {
			if (extArr[i].toLowerCase() == ext.toLowerCase()) {
				extCheck = true;
				break;
			}
		}
		if (extCheck == false) {
			alert('Este tipo de arquivo não é válido.\nApenas as seguintes extensões são aceitas: ' + extensoes + '.');
			field.focus();
			field.uploadOK = false;
			return;
		}
	} else {
		if (!re.test(fileName)) {
			alert('Este tipo de arquivo não é válido.\nApenas as seguintes extensões são aceitas: ' + extensoes + '.');
			field.focus();
			field.uploadOK = false;
			return;
		}
	}
	field.uploadOK = true;
}

function checkImageDimensions(field,sizeL,minW,minH,maxW,maxH,saveW,saveH) {
	var agt = navigator.userAgent.toLowerCase();
	var is_mac = (agt.indexOf("mac") != -1);
  var is_ie = document.all;
	var is_ns6 = (!document.all && document.getElementById ? true : false);
	var fileURL = field.value;
	if (is_ie && is_mac) {
		begPos = fileURL.indexOf('/',1);
		if (begPos != -1) {
			fileURL = fileURL.substring(begPos+1,fileURL.length);
		}
	}
	fileURL = 'file:///' + fileURL.replace(/:\\/gi,'|/').replace(/\\/gi,'/').replace(/:([^|])/gi,'/$1').replace(/"/gi,'').replace(/^\//,'');
	if (!field.gp_img || (field.gp_img && field.gp_img.src != fileURL) || is_ns6) {
		if (is_ie && is_mac) {
			var dummyImage;
			dummyImage = document.createElement('IMG');
			dummyImage.src = 'dummy.gif';
			dummyImage.name = 'PPP';
			field.gp_img = dummyImage;
		} else {
			field.gp_img = new Image();
		}
		with (field) {
			gp_img.field = field;
			gp_img.tamanhoMaximo = sizeL*1024;
			gp_img.minWidth = minW;
			gp_img.minHeight = minH;
			gp_img.maxWidth = maxW;
			gp_img.maxHeight = maxH;
			gp_img.saveWidth = saveW;
			gp_img.saveHeight = saveH;
			gp_img.onload = showImageDimensions;
			gp_img.src = fileURL+'?a=123'; // +(Math.round(Math.random()*998)+1);
		}
	}
}

function showImageDimensions(fieldImg) {
	var is_ns6 = (!document.all && document.getElementById ? true : false);
	var img = (fieldImg && !is_ns6 ? fieldImg : this);
	if (img.width > 0 && img.height > 0) {
		if ((img.minWidth != '' && img.minWidth > img.width) || (img.minHeight != '' && img.minHeight > img.height)) {
			alert('Uploaded Image is too small!\nShould be at least ' + img.minWidth + ' x ' + img.minHeight);
			img.field.uploadOK = false;
			return;
		}
		if ((img.maxWidth != '' && img.width > img.maxWidth) || (img.maxHeight != '' && img.height > img.maxHeight)) {
			alert('Uploaded Image is too big!\nShould be max ' + img.maxWidth + ' x ' + img.maxHeight);
			img.field.uploadOK = false;
			return;
		}
		if (img.tamanhoMaximo != '' && img.fileSize > img.tamanhoMaximo) {
			alert('Uploaded Image File Size is too big!\nShould be max ' + (img.tamanhoMaximo/1024) + ' KBytes');
			img.field.uploadOK = false;
			return;
		}
		if (img.saveWidth != '') {
			document.PU_uploadForm[img.saveWidth].value = img.width;
		}
		if (img.saveHeight != '') {
			document.PU_uploadForm[img.saveHeight].value = img.height;
		}
		img.field.uploadOK = true;
	}
}


function showProgressWindow() {
	var progressFile='fileCopyProgress.htm';
	var popWidth=300;
	var popHeight=100;
	var showProgress = false, form, field;
	for (var f = 0; f<document.forms.length; f++) {
		form = document.forms[f];
		for (var i = 0; i<form.elements.length; i++) {
			field = form.elements[i];
			if (!field.type || field.type.toUpperCase() != 'FILE') {
				continue;
			}
			if (field.value != '') {
				showProgress = true;
				break;
			}
		}
	}
	if (showProgress && document.MM_returnValue) {
		var w = 480, h = 340;
		if (document.all || document.layers || document.getElementById) {
			w = screen.availWidth; h = screen.availHeight;
		}
		var leftPos = (w-popWidth)/2, topPos = (h-popHeight)/2;
		document.progressWindow = window.open(progressFile,'ProgressWindow','toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width=' + popWidth + ',height='+popHeight);
		document.progressWindow.moveTo(leftPos, topPos);
		document.progressWindow.focus();
		window.onunload = function () {
			document.progressWindow.close();
		};
	}
}