function trim(s){  
  	while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r')){
    	s = s.substring(1,s.length);
  	}
  	
	while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r')){
    	s = s.substring(0,s.length-1);
  	}
  	return s;
}

function chkboxvalue(x){
	if(trim(x.search_text.value)=="")	{
		alert("Please enter search crieteria!");
		x.search_text.focus();
		return false;
	}
	return true;
}