function validate_form ( )
	{
		valid = true;
		var alertText = "";
		
			if ( document.contact_form.name.value == "" )
			{
					alertText += "Please enter your Name. \n";
					valid = false;
			}
			
			if ( document.contact_form.company.value == "" )
			{
					alertText += "Please enter your Company Name. \n";
					valid = false;
			}		
			
			if ( document.contact_form.telephone.value == "" )
			{
					alertText += "Please enter your Telephone No. \n";
					valid = false;
			}
			
			if ( document.contact_form.email.value == "" )
			{
					alertText += "Please enter your Email Address. \n";
					valid = false;
			}
			
			if ( document.contact_form.iama.value == "" )
			{
					alertText += "Please select your Type of Company. \n";
					valid = false;
			}
			
			if ( document.contact_form.iama.value == "other" && document.contact_form.other.value =="" )
			{
					alertText += "Please fill in the 'other' field. \n";
					valid = false;
			}
			
			if(valid == false){
			alert(alertText);
			}
			return valid;
	}