// JavaScript Document
function select_searchbar(type,obj){
		if (type=="selling"){
			obj.className='side_lrt_3';
			buying.className="side_brt_3";
			products.className="side_brt_3";
			company.className="side_brt_3";
			search_title.innerHTML="Search Sell";
			search_form.action="/search.html?which=sell";
		}else if (type=="buying"){
			obj.className="side_lrt_3";
			selling.className="side_blt_3";
			products.className="side_brt_3";
			company.className="side_brt_3";
			search_title.innerHTML="Search Buy";
			search_form.action="/search.html?which=buy";
		}else if (type=="products"){
			obj.className="side_lrt_3";
			selling.className="side_blt_3";
			buying.className="side_blt_3";
			company.className="side_brt_3";
			search_title.innerHTML="Search Products";
			search_form.action="/search.html?which=products";
		}else if (type=="company"){
			obj.className="side_lrt_3";
			selling.className="side_blt_3";
			buying.className="side_blt_3";
			products.className="side_blt_3";		
			search_title.innerHTML="Search Companies";
			search_form.action="/search.html?which=company";
		}
	}
function select_search(){
		var keyword=document.search_form.Keyword.value
		regexp = /^[a-z0-9][a-z0-9_ +]*$/i;
		if (keyword==""){
			alert("Please input a search keyword!")
			return false;
			}
		if(keyword.search(regexp) ==-1){
			alert("Please use only letters(a-z) and numbers(0-9) for your keyword!")
			return false;
		}	
	}