function ChangeImgSrc(obj_name,filename){
	document.images[obj_name].src=filename;
}

function preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}

function clearItemID(formname) {
	numField=document.forms[formname].length;
	savedForm = new Array(numField);
	for (i=0; i < numField; i++) {
		if (document.forms[formname].elements[i].type != 'file') {
			savedForm[i] = document.forms[formname].elements[i].value;
		}
	}
	document.forms[formname].reset();
	for (i=0; i<numField; i++) {
		if (document.forms[formname].elements[i].type != 'file') {
			document.forms[formname].elements[i].value = savedForm[i];
		}
	}
}

function ChangePortSrc(formname,objname,imgname){
		inValue=document.forms[formname].elements[objname].value;
		document.images[imgname].src=inValue;
	}

function CheckPortForUpload(formname,objname,imgname){
		inValue=document.forms[formname].elements[objname].value;
		file_name_arr=inValue.split('.');
		file_ext=file_name_arr[file_name_arr.length-1].toLowerCase();
		if (file_ext=='jpg' || file_ext=='jpeg' || file_ext=='jpe') {
                        if(imgname!=''){ChangePortSrc(formname,objname,imgname);}
			}
		else{
		      alert('Изображение должно иметь формат JPEG');
		      clearItemID(formname);
                      }
	}