function contact_us()
{
	var f = document.contact;  
	if(f.pname.value==0) {
		alert ("Please enter your name!");
		f.pname.focus();
		return false;
	}
	
	if(f.address.value==0) {
		alert ("Please enter your address!");
		f.address.focus();
		return false;
	}
	 if(f.contact.value==0) {
		alert ("Please enter contact number!");
		f.contact.focus();
		return false;
	}
	if (isNaN(f.contact.value)==true) {
   alert("Please enter valid number ");
   f.contact.value="";
   f.contact.focus();
   return false;
   } 
   if(f.email.value==0) {
		alert ("Please enter your Email!");
		f.email.focus();
		return false;
   }
	if(f.email.value == "" || f.email.value == " ") {
		alert ("Please enter a valid E-mail addresd.\n" +"Example: name@gmail.com");
		f.email.focus()
		return false;
	} else if(f.email.value.indexOf("@")<1 ||
    	f.email.value.indexOf(".")==-1 ||
    	f.email.value.indexOf(",")!=-1 ||
    	f.email.value.indexOf(" ")!=-1 ||
    	f.email.value.length<6)
	  {
		alert("Please enter a valid E-mail addresd.\n" + "Example: name@gmail.com");
		 f.email.focus();
		 return false;
	  }
  
    if(f.subject.value==0) {
		alert ("Please enter your subject!");
		f.subject.focus();
		return false;
   }
   if(f.comments.value==0) {
		alert ("Please enter your comments!");
		f.comments.focus();
		return false;
  }

	return true;
}