function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
 }
   
function checkTextField(obj,errMsg){
if(obj.value==''){
		alert(errMsg);
		obj.focus();
		return false;
		}
return true;
}


function checkDateField(obj,errMsg){
var value=obj.value;
var arr_value=value.split("/");

if(arr_value.length!=3){
		alert(errMsg);
		obj.focus();
		return false;
}


if(!IsNumeric(arr_value[0])|| !IsNumeric(arr_value[1]) ||  !IsNumeric(arr_value[2])){
		alert(errMsg);
		obj.focus();
		return false;
}


return true;
}




function checkSelectField(obj,errMsg){
var value=obj.options[obj.selectedIndex].value;
if(value==""){
		alert(errMsg);
		obj.focus();
		return false;
}
return true;
}

function IsEmail(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail address")
		    return false
		 }

 		 return true					
	}