//makes value of field empty
function make_blank(field,text){
	if(field.value == text){
		field.value = "";
	}
}
//changes the value of a field
function change_value(field,text){
	if(field.value == ""){
		field.value = text;
	}
}

//Bring up poup box for confiming buttons
function confirmClick(text){
	if (!confirm(text)){
		return false; 
	}
}


function isNumeric(sText){
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;
 
   for (i=0;i<sText.length&&IsNumber==true;i++){ 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1){
         IsNumber = false;
      }
   }
   return IsNumber;
   
}