String.repeat = function(chr,count)
{    
    var str = ""; 
    for(var x=0;x<count;x++) {str += chr}; 
    return str;
}
String.prototype.padL = function(width,pad)
{
    if (!width ||width<1)
        return this;   
 
    if (!pad) pad=" ";        
    var length = width - this.length
    if (length < 1) return this.substr(0,width);
 
    return (String.repeat(pad,length) + this).substr(0,width);    
}    
String.prototype.padR = function(width,pad)
{
    if (!width || width<1)
        return this;        
 
    if (!pad) pad=" ";
    var length = width - this.length
    if (length < 1) this.substr(0,width);
 
    return (this + String.repeat(pad,length)).substr(0,width);
} 

String.format = function(frmt,args)
{   
    for(var x=0; x<arguments.length; x++)
    {
        frmt = frmt.replace("{" + x + "}",arguments[x+1]);
    }
    return frmt;
}

Date.prototype.formatDate = function(format)
{
    var date = this;
    if (!format)
      format="MM/dd/yyyy";               
 
    var month = date.getMonth() + 1;
    var year = date.getFullYear();    
 
    format = format.replace("MM",month.toString().padL(2,"0"));        
 
    if (format.indexOf("yyyy") > -1)
        format = format.replace("yyyy",year.toString());
    else if (format.indexOf("yy") > -1)
        format = format.replace("yy",year.toString().substr(2,2));
 
    format = format.replace("dd",date.getDate().toString().padL(2,"0"));
 
    var hours = date.getHours();       
    if (format.indexOf("t") > -1)
    {
       if (hours > 11)
        format = format.replace("t","pm")
       else
        format = format.replace("t","am")
    }
    if (format.indexOf("HH") > -1)
        format = format.replace("HH",hours.toString().padL(2,"0"));
    if (format.indexOf("hh") > -1) {
        if (hours > 12) hours - 12;
        if (hours == 0) hours = 12;
        format = format.replace("hh",hours.toString().padL(2,"0"));        
    }
    if (format.indexOf("mm") > -1)
       format = format.replace("mm",date.getMinutes().toString().padL(2,"0"));
    if (format.indexOf("ss") > -1)
       format = format.replace("ss",date.getSeconds().toString().padL(2,"0"));
    return format;
}