function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}



function open_win(url,largura,altura,center)
{
    xposition=0; yposition=0;
    if ((parseInt(navigator.appVersion) >= 4 ) && (center)){
        xposition = (screen.width - altura) / 2;
        yposition = (screen.height - largura) / 2;
    }

    var args = "";
    	args += "width=" + largura + "," + "height=" + altura + ","
		+ "location=0,"
		+ "menubar=0,"
		+ "resizable=0,"
		+ "scrollbars=0,"
		+ "statusbar=false,dependent,alwaysraised,"
		+ "status=false,"
		+ "titlebar=no,"
		+ "toolbar=0,"
		+ "hotkeys=0,"
		+ "screenx=" + xposition + ","  //NN Only
		+ "screeny=" + yposition + ","  //NN Only
		+ "left=" + xposition + ","     //IE Only
		+ "top=" + yposition;           //IE Only

    	var dmcaWin = window.open(url,'',args);
    	dmcaWin.focus();
}