function validateform()
{
if(document.contactform.sel_dept.value=="")
{
	alert("please select department.");
	document.contactform.sel_dept.focus();
	return false;
}
if(document.contactform.txt_name.value=="")
{
	alert("please enter valid name.");
	document.contactform.txt_name.focus();
	return false;
}
if(!isAlphanumeric(document.contactform.txt_name.value,true,true))
{ 
	alert("please enter valid name.");
	document.contactform.txt_name.focus();
	return false; 
}	
if(document.contactform.txt_subject.value=="")
{
	alert("please enter valid subject.");
	document.contactform.txt_subject.focus();
	return false;
}
/*if(document.contactform.txt_company_name.value=="")
{
	alert("please enter valid company name.");
	document.contactform.txt_company_name.focus();
	return false;
}*/
if(document.contactform.txt_e_mail.value=="")
{
	alert("please enter valid e-mail address.");
	document.contactform.txt_e_mail.focus();
	return false;
}
if(!isEmail(document.contactform.txt_e_mail.value))
{ 
	alert("please enter valid e-mail address.");
	document.contactform.txt_e_mail.focus();
	return false; 
}	
}