Java script usefull functions for float dive check ineteger and check dates day

How to float dive using javascript

var ns = (navigator.appName.indexOf("Netscape") != -1);
var d = document;
function JSFX_FloatDiv(id, sx, sy) {
    var el = d.getElementById ? d.getElementById(id) : d.all ? d.all[id] : d.layers[id];
    var px = document.layers ? "" : "px";
    window[id + "_obj"] = el;
    if (d.layers) el.style = el;
    el.cx = el.sx = sx; el.cy = el.sy = sy;
    el.sP = function(x, y) { this.style.left = x + px; this.style.top = y + px; };

    el.floatIt = function() {
        var pX, pY;
        pX = (this.sx >= 0) ? 0 : ns ? innerWidth :
        document.documentElement && document.documentElement.clientWidth ?
        document.documentElement.clientWidth : document.body.clientWidth;
        pY = ns ? pageYOffset : document.documentElement && document.documentElement.scrollTop ?
        document.documentElement.scrollTop : document.body.scrollTop;
        if (this.sy < 0)
            pY += ns ? innerHeight : document.documentElement && document.documentElement.clientHeight ?
        document.documentElement.clientHeight : document.body.clientHeight;
        this.cx += (pX + this.sx - this.cx) / 8; this.cy += (pY + this.sy - this.cy) / 8;
        this.sP(this.cx, this.cy);
        setTimeout(this.id + "_obj.floatIt()", 40);
    }
    return el;
}

  var dtCh= "/";
        var dtCh2= "-";
        var minYear=1900;
        var maxYear=2100;

 Validate integer

        function isInteger(s)
        {
            var i;
            for (i = 0; i < s.length; i++)
                {  
                // Check that current character is number.
                var c = s.charAt(i);
                if (((c < "0") || (c > "9"))) return false;
               }
            // All characters are numbers.
            return true;
        }

        function stripCharsInBag(s, bag)
        {
            var i;
            var returnString = "";
            // Search through string's characters one by one.
            // If character is not in bag, append to returnString.
            for (i = 0; i < s.length; i++)
            {  
                var c = s.charAt(i);
                if (bag.indexOf(c) == -1) returnString += c;
            }
            return returnString;
        }

Check February month last day

        function daysInFebruary (year)
        {
            // February has 29 days in any year evenly divisible by four,
            // EXCEPT for centurial years which are not also divisible by 400.
            return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
        }
       
        function DaysArray(n)
        {
            for (var i = 1; i <= n; i++)
            {
                this[i] = 31
                if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
                if (i==2) {this[i] = 29}
           }
           return this
        }