var daysInMonth = DaysArray(12);
var req;

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 isFloat(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")) && c != ".") {
        	return false;
        }
    }
   	if (isNaN(parseFloat(s)))
   		return false;
    return true;
}

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
}

function stringIsDate(s) {
	var ymd = s.split("/");
	if (ymd.length != 3)
		return false;
	if ((ymd[1] == 2 && ymd[2] > daysInFebruary(ymd[0])) || ymd[2] > daysInMonth[ymd[1]])
		return false;
	return true;
}

function loadRemoteData(url) {
	req = false;
    // branch for native XMLHttpRequest object
    if(window.XMLHttpRequest) {
    	try {
			req = new XMLHttpRequest();
        } catch(e) {
			req = false;
        }
    // branch for IE/Windows ActiveX version
    } else if(window.ActiveXObject) {
       	try {
        	req = new ActiveXObject("Msxml2.XMLHTTP");
      	} catch(e) {
        	try {
          		req = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch(e) {
          		req = false;
        	}
		}
    }
	if(req) {
		req.open("GET", url, false);
		req.send("");
	}
}

function checkEmailAddr(em) {
	// code to validate the email address
	
	var len = em.length;
	
	for (var i = 0; i < len; i++) {
		var c = em.charAt(i);
		if(!((c >= "A" && c <= "Z")||(c >= "a" && c <= "z")||(c >= "0" && c <= "9")||(c == "-")||(c == "_")||(c == ".")||(c == "@"))) 
		{
			return false;
		}
	}
	if ((em.indexOf("@")==-1)||(em.indexOf("@")==0)||(em.indexOf("@")==(len-1))) {
		return false;
	}
	if((em.indexOf("@")!=-1)&&(em.substring(em.indexOf("@")+1,len).indexOf("@")!=-1)) 
	{
		return false; 
	}
	
	if((em.indexOf(".")==-1)||(em.indexOf(".")==0)||(em.lastIndexOf(".")==(len-1))) 
	{
		return false;
	}
	
	return true;
}