function isUAEMobile(txt) {
    if(txt==null || txt.value=='')
        return true;
    if(txt==null || txt.value.length != 10 || isNaN(txt.value) || (txt.value.indexOf("050")!=0 && txt.value.indexOf("055")!=0 && txt.value.indexOf("056")!=0)) {
      alert("plase enter a valid UAE mobile number");
      txt.focus();
      txt.select();
      return false;
    }
    return true;
}
function isNumeric(txt) {
	if(isNaN(txt.value)) {
		alert("plase enter a number");
		txt.focus();
		txt.select();
		return false;
	}
	return true;
}
	function validateDate(dtTxt,chkgreater) {
             
		if(dtTxt.value=="")
			return true;
		else {
                        formatDateStr(dtTxt);
			if(!isDate(dtTxt.value)) {
				dtTxt.focus();
				dtTxt.select();
                                return false;
			}
                        if(chkgreater==true && isDate(dtTxt.value)){
                            if(isgreaterDate(dtTxt.value)){
                                alert("please enter a smaller date");
                            }
                        }
			return false;
		}
	}
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function formatDateStr(dtTxt){
    var len= dtTxt.value.length;
    dtStr=dtTxt.value;  
    if(dtStr.length>=2){
        if(dtStr.substring(2,3)!="/"){
             dtStr=dtStr.substring(0,2) + "/" + dtStr.substring(2,dtStr.length);             
        }
    }
    if(dtStr.length>=5){
        if(dtStr.substring(5,6)!="/"){
             dtStr=dtStr.substring(0,5) + "/" + dtStr.substring(5,dtStr.length);
        }
    }
    dtTxt.value=dtStr;    
}

function isgreaterDate(dtStr){
    var pos1=dtStr.indexOf(dtCh)
    var pos2=dtStr.indexOf(dtCh,pos1+1)
    var gd=new Date();
    strDay=dtStr.substring(0,pos1);
    strMonth=dtStr.substring(pos1+1,pos2);
    strYear=dtStr.substring(pos2+1);
    if(strYear > gd.getFullYear()){
        return true;
    }else if(strYear== gd.getFullYear()){
        if(strMonth > gd.getMonth()+1){
            return true;
        }else if(strMonth==gd.getMonth()+1){
            if(strDay >=gd.getDate()){
                return true;
            }
        }
    }
    return false;
    
}
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;
}

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 isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function isValidEmail(txt) {
			
			if(txt.value=="") {
				
				return true;
			}
			if(txt.value.indexOf("@")==-1 || txt.value.indexOf(".")==-1) {
				alert("please enter a valid email")
				txt.focus();
				return;
			}
                        if(txt.value.indexOf(" ")!=-1) {
				alert("please remove space from e-mail")
				txt.focus();
				return;
			}
                        if(txt.value.indexOf(":")!=-1) {
				alert("please remove : from e-mail")
				txt.focus();
				return;
			}
                        if(txt.value.indexOf(",")!=-1) {
				alert("please remove , from e-mail")
				txt.focus();
				return;
			}
                        if(txt.value.indexOf(";")!=-1) {
				alert("please remove ; from e-mail")
				txt.focus();
				return;
			}
                         if (txt.value.charAt(0)=="@" ){
                             alert("please enter a valid email")
				txt.focus();
				return;
                         }
                         if (txt.value.charAt(0)=="%" || txt.value.charAt(0)=="." || txt.value.charAt(0)=="#" || txt.value.charAt(0)=="&" || txt.value.charAt(0)=="$"){
                             alert("please enter a valid email")
				txt.focus();
				return;
                         }
	}
function showtip(message){
    //document.getElementById("messageHolder").innerHTML=message;    
}    
function hidetip(){
    //document.getElementById("messageHolder").innerHTML="";
}