<script>
function check(){
	i=0;
	disabledtest="document.form.submit1.disabled=(false";
	while(document.form.elements[i]) {
		if(document.form.elements[i].type=="text"||document.form.elements[i].type=="textarea")  disabledtest += "||document.form.elements["+i+"].value==''";
		i++;
	}
	disabledtest+=")";
	eval(disabledtest);
}
</script>
<form name=form>
<input type=text name="t1" onpropertychange="check();">
<input name="t2" onpropertychange="check();">
<input type="password" name="t3" onpropertychange="check();"> 
<textarea name="content" rows="5" cols="60"  onpropertychange="check();"><? echo $info;?></textarea>
<input type="submit" name="submit1" disabled>
</form>