clear_field=function(field, message){
var f_val = document.getElementById(field);
if(f_val.value == message){
f_val.className = "searchinput sdark";
f_val.value = "";
}
}

check_field=function(field, message){
var f_val = document.getElementById(field)
if((f_val.value).length==0){
f_val.value = message;
f_val.className = "searchinput slight";
}

}