function validate_form()
{
  if(document.contactform.strName.value=='')
  {
  	alert("Enter your full name!");
	document.contactform.strName.focus();
  return false;
  }
 if(document.contactform.strEmailAddress.value=='')
  {
  alert("please enter the email address!");
	document.contactform.strEmailAddress.focus();
  	return false;
  }
   if(document.contactform.txtComments.value=='')
  {
  alert("Please enter your Message!");
	document.contactform.txtComments.focus();
  	return false;
  }
  return true;
}
//To check the email format
function validEmail(emailid) {      invalidChars = "/:,;";
				if(emailid== "") {                      			 return true;      } 
				for  (i=0; i<invalidChars.length ; i++) {  	//check for Invalid  Characters	
				badChar = invalidChars.charAt(i);
				if (emailid.indexOf(badChar , 0) > -1)
				{	          return false; 	   }      }     
				atPos = emailid.indexOf("@" ,1);			//check for @
				  if(atPos == -1){  	  return false;      } 
				  if (emailid.indexOf("@" , atPos +1) !=-1) { 	//check for only one @	   
				  return false ;     } 
				  periodPos = emailid.indexOf("." , atPos);
				  // atleas one . after @      
				  if (periodPos == -1){	   return false;      }
				  if(periodPos + 3 > emailid.length){           return false;      }      return true;  } 
				  
                function validateEmail(){  
				  if(!validEmail(document.contactform.strEmailAddress.value))
				  {            alert("Invalid e-mail Format");                    
				  document.contactform.strEmailAddress.select();
				  return false;        }
				  return true;
	
	}