获取div光标并插入图片

//显示图片
function showImage(div_id,img_src) {
    //IE support  
    if (document.selection) {
    	var myField = document.getElementById(div_id);   //对象   
        var myValue = '<img src = "'+img_src+'"/>';  //值
        myField.focus();
        var sel = document.selection.createRange();
        sel.pasteHTML(myValue);
    }else {
    	var sel = div_range;
    	if(sel == null || sel == 'undefined'){
    		myfocus(div_id);
    		sel = document.getSelection().getRangeAt(0);
    	}
        var img = document.createElement("img");
        img.src = img_src;
        sel.insertNode(img);
    }
}
var div_range;
function divOnmouseout(){
	var sel = document.getSelection();
	if(sel){//ff,ch
		div_range = sel.getRangeAt(0);
	}

//获取焦点
function myfocus(obj) {
    if (typeof obj == 'string') obj = document.getElementById(obj);
    obj.focus();
    if (obj.createTextRange) {//ie
        var rtextRange = obj.createTextRange();
        if(obj.value == null || obj.value == '') return;
        rtextRange.moveStart('character', obj.value.length);
        rtextRange.collapse(true);
        rtextRange.select();
    }else if (obj.selectionStart){//chrome "<input>"、"<textarea>"
        obj.selectionStart = obj.value.length;
    }else if(window.getSelection){
	    var sel = window.getSelection();
	    var tempRange = document.createRange();
	    if(obj.firstChild == null || obj.firstChild == '') return;
	    tempRange.setStart(obj.firstChild, obj.firstChild.length);
	    sel.removeAllRanges();
	    sel.addRange(tempRange);
	}
}
}