function ask(e)
    {
        if(!e)
            e=event;
        if(!confirm("Are you sure to perform the task ?"))
        {
            try
            {
                e.preventDefault();
            }
            catch(ex){}
            e.returnValue=false;
        }
    }
    
    function echeck(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 ("Please enter valid E-mail address.")
           return false
        }

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

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

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

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

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

         return true
}