function validate_required(field,alerttxt)
			{
				with (field)
				{
					if (value==null||value=="")
				  		{alert(alerttxt);return false}
					else {return true}
				}
			}
			
			function validate_form(thisform)
			{
				with (thisform)
				{
					if (validate_required(name,"Please complete the name field!")==false)
						{name.focus();return false}
					if (validate_required(email,"Please complete the email field!")==false)
						{email.focus();return false}
			  
					if (validate_email(email,"Not a valid e-mail address!")==false)
						{email.focus();return false}
				
					if (validate_required(enquiry,"Enquiry field must not be blank!")==false)
					{enquiry.focus();return false}
				}
			}
			
			function validate_email(field,alerttxt)
			{
				with (field)
				{
					apos=value.indexOf("@")
					dotpos=value.lastIndexOf(".")
					if (apos<-1||dotpos-apos<2) 
			  			{alert(alerttxt);return false}
					else {return true}
				}
			}