function fieldchek(fld){
	// name of mandatory fields
	var fieldlist = Array("Name", "Email", "Comments");
	// field description to appear in the dialog box
	var labels = Array("Name", "Email", "Message");
	// dialog message
	var prompt = "Please complete the following fields:\n";
	
	var promptlth = prompt.length;
	
	for (var i = 0; i < fieldlist.length; i++){
		var curr = fld.elements[fieldlist[i]];
		if (curr){
			if (curr.type == null){
				var filled = false;
				for (var j = 0; j < curr.length; j++){
					if (curr[j].checked){
						filled = true;
					}
				}
				if (!filled){
					prompt += " - " + labels[i] + "\n";
				}
				continue;
			}

			switch(curr.type){
			case "select-one":
				if (curr.selectedIndex == -1 || curr.options[curr.selectedIndex].text == ""){
					prompt += " - " + labels[i] + "\n";
				}
				break;
			case "select-multiple":
				if (curr.selectedIndex == -1){
					prompt += " - " + labels[i] + "\n";
				}
				break;
			case "text":
			case "textarea":
				if (curr.value == "" || curr.value == null){
					prompt += " - " + labels[i] + "\n";
				}
				break;
			default:
			}
		}
	}

	if (prompt.length == promptlth){
		return true;
	}else{
		alert(prompt);
		return false;
	}
}