function validate() {
	 if(document.speaker.name.value=='')
		{
		alert('Please Enter your name');
		return false;
		}
	 if(document.speaker.callsign.value=='')
		{
		alert('Please Enter your Call Sign');
		return false;
		}
         if(document.speaker.email.value=='')
		{
		alert('Please Enter a valid email');
		return false;
		} 
         if(document.speaker.phone.value=='')
		{
		alert('Please Enter a contact Phone');
		return false;
		} 
         if(document.speaker.subject.value=='')
		{
		alert('Please Enter the subject you would like to present');
		return false;
		} 
        if(document.speaker.blocks.selectedIndex == 0)
		{
		alert('Please Select at least one block');
		return false;
		}
     	 if ( document.speaker.day.checked == false )
               {
              alert ( "Please check the at least one day." );
              valid = false;
               }
else	{
		return true;
			}
}