javascript去空格

<script language="javascript"><!--//javascript去空格函数 function LTrim(str){ //去掉字符串 的头空格var i;for(i=0;i<str.length; i++) {if(str.charAt(i)!=" ") break;}str = str.substring(i,str.length);return str;}function RTrim(str){var i;for(i=str.length-1;i>=0;i--){if(str.charAt(i)!=" "&&str.charAt(i)!=" ") break;}str = str.substring(0,i+1);return str;}function Trim(str){return LTrim(RTrim(str));}function check() {if(Trim(document.reply.title.value) == "") {alert("please intput the title!");document.reply.title.focus();return false;}if(Trim(document.reply.cont.value) == "") {alert("plsease input the content!");document.reply.cont.focus();return false;}return true;}--></script>