/*
	Used for ensuring a number text box actually contains a number.
	Designed by ????.
	
	
	TO USE: Include below in your textbox or in a span element surrounding your asp:TextBox.	
	onblur="javascript:validNumber(this);"
		
*/

function validNumber(field) {
	var valid = "0123456789.";
	var ok = "yes";
	var temp;
	for (var i=0; i<field.value.length; i++) {
		temp = "" + field.value.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") ok = "no";
	}
	if (ok == "no") {

		field.focus();
		field.select();
		field.value='';
	}
}