function validate_form()
{
	if(document.contact_form.companyname.value=="")
	{
		alert("Please enter your Company Name");
		document.contact_form.companyname.focus();
		return false;
	}
	
	if(document.contact_form.name.value=="")
	{
		alert("Please enter your name");
		document.contact_form.name.focus();
		return false;
	}


		
var string1=document.contact_form.email.value;
	if(string1=="")
	{
		alert("Please enter your e-mail address");
		document.contact_form.email.focus();
		return false;
	}

	if((string1.indexOf("@")==-1)|| (string1.indexOf(".")==-1))
	{
		alert("Please enter a valid email address");
		document.contact_form.email.focus();
		return false;
	}
return true;

}