function minSize(string,min){if(string.length<min)return false;return true;}
function isNull(string){if((string=="")||(string==null))return true;return false;}
function notNull(string){if((string=="")||(string==null))return false; return true;}
function isSNull(selfield){if(selfield.selectedIndex==0)return true; return false;}
function maxSize(string,max){if(string.length>max)return false; return true;}
function eqSize(string,sz){if(string.length!=sz) return false; return true;}
function minVal(string,min){if(isNaN(string))return false;if(string<min)return false;return true;}
function maxVal(string,max){if(isNaN(string))return false; if(string>max)return false;return true;}
function betVal(string,min,max){if(isNaN(string))return false; if(string>max||string<min)return false;return true;}
function eqVal(string,vl){if(string!=vl)return false;return true;}
function neqVal(string,vl){if(string==vl)return false;return true;}
function teqVals(string1,string2){if (string1!=string2)return false;return true;}
function isMail(str){var at="@";var dot=".";var lat=str.indexOf(at);var lstr=str.length;var ldot=str.indexOf(dot);if(str.indexOf(at)==-1)return false;if(str.indexOf(at)==-1||str.indexOf(at)==0||str.indexOf(at)==lstr)return false;if(str.indexOf(dot)==-1||str.indexOf(dot)==0||str.indexOf(dot)==lstr)return false; if (str.indexOf(at,(lat+1))!=-1) return false; if (str.substring(lat-1,lat)==dot||str.substring(lat+1,lat+2)==dot)return false;if(str.indexOf(dot,(lat+2))==-1)return false;if(str.indexOf(" ")!=-1) return false;return true;}
function isImage(s){if((s.replace(' ', ''))!=''){var len=s.length; var ext=s.substr(len-3);var okexts=Array('jpg','jpeg','png');var okextscnt=okexts.length;for(i=0;i<okextscnt; i++)if(ext==okexts[i])return true;return false;}return true;}