function isYoutubeFormat(url){

	
	if(url == '') return(1);
	
	str = "http://www.youtube.com/watch?v=";
	
	if(str !=  url.substring(0,str.length))
		return (0);
	else
		return (1);

}	


function isMailFormat(myMail){

	if(myMail == '') return(1);

	if(myMail.toUpperCase().indexOf('@')<=0) return(0)
	if((myMail.toUpperCase().lastIndexOf('.')-myMail.toUpperCase().indexOf('@'))<2) return(0)
	if(myMail.toUpperCase().lastIndexOf('.') == (myMail.length-1)) return(0)
	return(1)
}	


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;

}